{"id":380,"date":"2026-11-07T17:20:50","date_gmt":"2026-11-07T08:20:50","guid":{"rendered":"https:\/\/brandagent.jp\/en_blog\/japan-patent-divisional-application\/"},"modified":"2026-11-07T17:24:28","modified_gmt":"2026-11-07T08:24:28","slug":"japan-patent-divisional-application","status":"publish","type":"post","link":"https:\/\/brandagent.jp\/en_blog\/japan-patent-divisional-application\/","title":{"rendered":"Patent Divisional Applications in Japan: When You Can Divide, How to Use Them, Fees and Translations (2026)"},"content":{"rendered":"<p><span style=\"font-size: 120%;\">&#8220;The examiner has allowed claims 1\u20135 but refused claims 6\u201310. Can we get the allowed claims granted now and keep fighting for the rest?&#8221; &#8220;We received a decision to grant, but our competitor&#8217;s product falls outside the claims. Is it too late?&#8221; &#8220;Our parent application was filed in English \u2014 does a divisional need a new translation?&#8221;<\/span><\/p>\n<p><span style=\"font-size: 120%;\">A <strong>divisional application<\/strong> (<em>bunkatsu shutsugan<\/em>) lets you carve out part of the inventions disclosed in a pending Japanese patent application and pursue them in a new application that keeps the original filing date. Used well, it is one of the most flexible tools in Japanese patent prosecution. Used too late, it is simply unavailable \u2014 the timing windows under Article 44 of the Patent Act are strict.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">In this article, Japanese Patent Attorney Toru Kano of BrandAgent explains when a Japanese application can be divided, the substantive requirements, common strategic uses, the official JPO fees, and what foreign applicants should know about translations and deadlines.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">*Information as of November 2026. Check the latest rules on the <a href=\"https:\/\/www.jpo.go.jp\/e\/\" target=\"_blank\" rel=\"noopener\">JPO website<\/a>.<\/span><\/p>\n<div class=\"st-mybox st-mybox-class\" style=\"margin: 18px 0; padding: 16px; border: 2px solid #e5e7eb; border-radius: 10px; background: #fafafa;\">\n<p><span style=\"font-size: 120%;\"><strong>What you will learn<\/strong><\/span><\/p>\n<ul style=\"margin: 10px 0 0 18px;\">\n<li><span style=\"font-size: 120%;\">The three timing windows for dividing a Japanese application<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Substantive requirements and the effect of a valid divisional<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Strategic uses: allowed claims first, continuing prosecution, post-grant divisionals<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Official fees, examination request deadlines and translations<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Pitfalls: the Article 50-2 notice and double patenting<\/span><\/li>\n<\/ul>\n<\/div>\n<h2><span style=\"font-size: 120%;\">Foreign applicants act through a Japanese patent attorney<\/span><\/h2>\n<p><span style=\"font-size: 120%;\">An applicant with no domicile or business office in Japan cannot deal with the JPO directly. Filing a divisional application, requesting its examination and responding to Office Actions must all be done through a representative in Japan \u2014 in practice a licensed Japanese patent attorney (<em>Benrishi<\/em>). At BrandAgent, every case is handled personally by the patent attorney, and we communicate in English and Chinese. Payment by PayPal (in JPY) or bank transfer is accepted.<\/span><\/p>\n<h2><span style=\"font-size: 120%;\">What is a divisional application?<\/span><\/h2>\n<p><span style=\"font-size: 120%;\">Under Article 44 of the Patent Act, an applicant can divide a patent application containing two or more inventions and file part of them as one or more new applications. If the requirements are met, the new application is treated as filed on the filing date of the original (parent) application. This means:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 120%;\">Novelty and inventive step are judged as of the parent&#8217;s filing date (or its priority date), not the date you actually file the divisional.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">The patent term is not extended: the JPO&#8217;s guidelines state that, where the substantive requirements are met, the parent&#8217;s filing date is treated as the filing date, and the term ends 20 years from that date (Art. 67(1)).<\/span><\/li>\n<li><span style=\"font-size: 120%;\">A divisional can itself be divided again (a &#8220;grandchild&#8221; application), as long as each generation meets the requirements.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-size: 120%;\">When can you divide? The three windows<\/span><\/h2>\n<p><span style=\"font-size: 120%;\">According to Article 44(1) and the JPO Examination Guidelines, a divisional can be filed only in these periods:<\/span><\/p>\n<table style=\"border-collapse: collapse; width: 100%;\" border=\"1\">\n<thead>\n<tr style=\"background-color: #f5f5f5;\">\n<th style=\"padding: 8px; text-align: left;\"><span style=\"font-size: 120%;\">Window<\/span><\/th>\n<th style=\"padding: 8px; text-align: left;\"><span style=\"font-size: 120%;\">Period<\/span><\/th>\n<th style=\"padding: 8px; text-align: left;\"><span style=\"font-size: 120%;\">Points to watch<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\"><strong>(1) Amendment period<\/strong><\/span><\/td>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\">Whenever the description, claims or drawings can be amended<\/span><\/td>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\">E.g. before the first Office Action, or within the response period of a notice of reasons for refusal<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\"><strong>(2) After a decision to grant<\/strong><\/span><\/td>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\">Within 30 days from service of the decision to grant<\/span><\/td>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\">Only while the application is still pending \u2014 once the patent is registered, it is too late<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\"><strong>(3) After a decision of refusal<\/strong><\/span><\/td>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\">Within 3 months from service of the first decision of refusal<\/span><\/td>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\">Linked to the appeal period (see below)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span style=\"font-size: 120%;\">The 30-day window after grant: watch the registration fee<\/span><\/h3>\n<p><span style=\"font-size: 120%;\">The 30-day window is not available for a decision to grant issued in reconsideration by the examiner before appeal, or after an appeal decision has remanded the case. More importantly, the patent is registered when the first registration (annuity) fee is paid, and from that moment the application is no longer pending. The JPO therefore recommends dividing <strong>on or before the day you file the fee payment<\/strong>. If the payment period is extended, the 30-day window is deemed extended accordingly (Art. 44(5)).<\/span><\/p>\n<h3><span style=\"font-size: 120%;\">The 3-month window after refusal: overseas applicants<\/span><\/h3>\n<p><span style=\"font-size: 120%;\">The window after a decision of refusal runs from the <strong>first<\/strong> decision of refusal; a second refusal issued after an appeal remand does not open a new window. Under Article 44(6), if the period for requesting an appeal against the refusal is extended under Article 4, the divisional window is deemed extended by the same period.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">This matters for overseas applicants. For patent appeals against a decision of refusal, the JPO extends the appeal period for applicants residing abroad (<em>zaigaisha<\/em>) by one month ex officio \u2014 3 months plus 1 month. In practice, an overseas applicant usually has up to 4 months from service of the decision of refusal to decide on both an appeal and a divisional. Always have your Japanese attorney confirm the exact date for your case.<\/span><\/p>\n<h2><span style=\"font-size: 120%;\">Substantive requirements<\/span><\/h2>\n<p><span style=\"font-size: 120%;\">The JPO examines whether a divisional is valid. In summary:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 120%;\"><strong>Not everything:<\/strong> the divisional must not claim all of the inventions in the parent (in practice this is rarely an issue).<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Within the parent as filed:<\/strong> the content of the divisional must be within what was disclosed in the parent&#8217;s original description, claims and drawings \u2014 tested like a new-matter check for amendments.<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Within the parent just before division:<\/strong> the content must also be within the parent&#8217;s description, claims and drawings immediately before the division.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 120%;\">If the substantive requirements are not met, the divisional loses the parent&#8217;s filing date and is examined as of its actual filing date \u2014 usually fatal, because the parent&#8217;s own publication then becomes prior art. The examiner may ask for an explanation of where the divisional&#8217;s claims are supported in the parent. Filing a short statement with the divisional explaining the changes and their basis makes examination smoother.<\/span><\/p>\n<h2><span style=\"font-size: 120%;\">Strategic uses<\/span><\/h2>\n<h3><span style=\"font-size: 120%;\">1. Get allowed claims granted now, keep fighting for the rest<\/span><\/h3>\n<p><span style=\"font-size: 120%;\">If only some claims are refused, you can delete the refused claims from the parent and obtain a patent quickly, while moving the refused subject matter to a divisional and continuing to argue (or amending differently). This is useful when you need an enforceable right soon \u2014 for licensing, investors or a competitor already on the market.<\/span><\/p>\n<h3><span style=\"font-size: 120%;\">2. Keep a family pending<\/span><\/h3>\n<p><span style=\"font-size: 120%;\">A pending divisional lets you adjust claims later to cover competitors&#8217; products or new embodiments that appear after the parent is granted. A post-grant divisional (window 2) is the last chance to do this for that parent.<\/span><\/p>\n<h3><span style=\"font-size: 120%;\">3. Respond to a final refusal<\/span><\/h3>\n<p><span style=\"font-size: 120%;\">After a decision of refusal, you can request an appeal, file a divisional with amended claims, or both. A divisional filed on the same day as the appeal request is generally treated as filed at the same time as the appeal. Choosing between appeal and divisional depends on whether the examiner&#8217;s reasoning can be overcome by argument or only by narrowing the claims.<\/span><\/p>\n<h3><span style=\"font-size: 120%;\">4. Cover other embodiments or unity issues<\/span><\/h3>\n<p><span style=\"font-size: 120%;\">If the examiner raises lack of unity, or the description contains embodiments that the current claims do not cover, a divisional lets you claim them without losing the original date.<\/span><\/p>\n<h2><span style=\"font-size: 120%;\">Pitfalls to avoid<\/span><\/h2>\n<ul>\n<li><span style=\"font-size: 120%;\"><strong>The Article 50-2 notice:<\/strong> if the divisional receives the same reason for refusal that was already notified in the parent (and you could have known it before requesting examination), the examiner adds an Article 50-2 notice. Your amendments are then restricted as if a final notice of reasons for refusal had been issued. Do not simply re-file the same refused claims.<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Double patenting:<\/strong> if the divisional claims the same invention as the parent after division, it can be refused under Article 39. The claims must be genuinely different.<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Separate examination request:<\/strong> a divisional is not examined automatically. Its examination must be requested within 3 years from the parent&#8217;s filing date \u2014 or, if that has already passed, within 30 days from the divisional&#8217;s filing date.<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Missed windows cannot be fixed:<\/strong> after registration, or after the refusal window closes without an appeal, the parent can no longer be divided.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-size: 120%;\">Official JPO fees<\/span><\/h2>\n<p><span style=\"font-size: 120%;\">A divisional is a new application, so the ordinary fees apply again (JPO fee table, November 2026):<\/span><\/p>\n<table style=\"border-collapse: collapse; width: 100%;\" border=\"1\">\n<thead>\n<tr style=\"background-color: #f5f5f5;\">\n<th style=\"padding: 8px; text-align: left;\"><span style=\"font-size: 120%;\">Item<\/span><\/th>\n<th style=\"padding: 8px; text-align: center;\"><span style=\"font-size: 120%;\">Official fee (JPY)<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\"><strong>Filing fee (Japanese-language application)<\/strong><\/span><\/td>\n<td style=\"padding: 8px; text-align: center;\"><span style=\"font-size: 120%;\">14,000<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\"><strong>Filing fee (foreign-language application)<\/strong><\/span><\/td>\n<td style=\"padding: 8px; text-align: center;\"><span style=\"font-size: 120%;\">22,000<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\"><strong>Request for examination (applications filed on or after 1 April 2019)<\/strong><\/span><\/td>\n<td style=\"padding: 8px; text-align: center;\"><span style=\"font-size: 120%;\">138,000 + 4,000 per claim<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><span style=\"font-size: 120%;\"><strong>Appeal against a decision of refusal (for comparison)<\/strong><\/span><\/td>\n<td style=\"padding: 8px; text-align: center;\"><span style=\"font-size: 120%;\">49,500 + 5,500 per claim<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-size: 120%;\">*For applications filed on or before 31 March 2019, the examination fee table is lower (118,000 + 4,000 per claim). For a divisional in an older family, confirm which table applies before paying. Annuities for a divisional granted later are paid like any other patent. Attorney fees depend on the work involved \u2014 ask for a free quote.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">Because the examination fee is charged again in full, keep the number of claims in a divisional focused. A divisional with a few well-chosen claims is often more effective \u2014 and cheaper \u2014 than one that copies all the parent&#8217;s claims.<\/span><\/p>\n<h2><span style=\"font-size: 120%;\">Translations for foreign applicants<\/span><\/h2>\n<p><span style=\"font-size: 120%;\">A divisional can be filed as a foreign-language application (for example in English), with a Japanese translation filed later. The normal translation deadline is 1 year and 4 months from the filing date (or the earliest priority date). Because a divisional&#8217;s deemed filing date is usually much earlier, the JPO allows the translation for a divisional to be filed within <strong>2 months from the divisional&#8217;s actual filing date<\/strong> even after the normal period has passed. If the translation is missing, the JPO sends a notice; if it is still not filed, the application is deemed withdrawn.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">In practice, when the parent already has a Japanese text, it is usually faster and safer to file the divisional directly in Japanese, based on the parent&#8217;s Japanese text. This also makes it easier to show that the divisional&#8217;s content is within the parent as filed.<\/span><\/p>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#ffebee;border-color:#ef9a9a;border-width:2px;border-radius:5px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#ef5350;font-weight:bold;text-shadow: #fff 3px 0px 0px, #fff 2.83487px 0.981584px 0px, #fff 2.35766px 1.85511px 0px, #fff 1.62091px 2.52441px 0px, #fff 0.705713px 2.91581px 0px, #fff -0.287171px 2.98622px 0px, #fff -1.24844px 2.72789px 0px, #fff -2.07227px 2.16926px 0px, #fff -2.66798px 1.37182px 0px, #fff -2.96998px 0.42336px 0px, #fff -2.94502px -0.571704px 0px, #fff -2.59586px -1.50383px 0px, #fff -1.96093px -2.27041px 0px, #fff -1.11013px -2.78704px 0px, #fff -0.137119px -2.99686px 0px, #fff 0.850987px -2.87677px 0px, #fff 1.74541px -2.43999px 0px, #fff 2.44769px -1.73459px 0px, #fff 2.88051px -0.838246px 0px;\"><i class=\"fa fa-check-circle st-css-no\" aria-hidden=\"true\"><\/i>Checklist when you receive a decision to grant or refusal<\/p><div class=\"st-in-mybox\">\n<ul>\n<li><span style=\"font-size: 120%;\">Decision to grant: decide on any divisional <strong>before<\/strong> instructing payment of the registration fee.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Decision of refusal: decide on appeal and divisional together, within the (extended) appeal period.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Check that the divisional&#8217;s claims are supported by the parent as filed.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Make the divisional&#8217;s claims different from the parent&#8217;s and from already-refused claims.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Diary the examination request deadline for the divisional.<\/span><\/li>\n<\/ul>\n<\/div><\/div>\n<h2><span style=\"font-size: 120%;\">FAQ<\/span><\/h2>\n<ul>\n<li><span style=\"font-size: 120%;\"><strong>Q. Can we divide after the patent has been registered?<\/strong><br \/>\nA. No. A divisional requires the parent to be pending. After a decision to grant, divide within 30 days and before the registration fee is paid.<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Q. Does a divisional get a new 20-year term?<\/strong><br \/>\nA. No. If the requirements are met, it is treated as filed on the parent&#8217;s filing date, and its term ends 20 years from that date.<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Q. How long do overseas applicants have after a decision of refusal?<\/strong><br \/>\nA. The window is 3 months from service, extended in line with any extension of the appeal period. For overseas residents the JPO extends the patent appeal period by one month ex officio, so usually 4 months in total.<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Q. Do we need to request examination of the divisional?<\/strong><br \/>\nA. Yes, within 3 years from the parent&#8217;s filing date, or within 30 days from filing the divisional if that period has already passed.<\/span><\/li>\n<li><span style=\"font-size: 120%;\"><strong>Q. Can we communicate in English or Chinese?<\/strong><br \/>\nA. Yes. Every case is handled personally by the Japanese patent attorney, in English or Chinese.<\/span><\/li>\n<\/ul>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#f1f8e9;border-color:#a5d6a7;border-width:2px;border-radius:5px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#4caf50;font-weight:bold;text-shadow: #fff 3px 0px 0px, #fff 2.83487px 0.981584px 0px, #fff 2.35766px 1.85511px 0px, #fff 1.62091px 2.52441px 0px, #fff 0.705713px 2.91581px 0px, #fff -0.287171px 2.98622px 0px, #fff -1.24844px 2.72789px 0px, #fff -2.07227px 2.16926px 0px, #fff -2.66798px 1.37182px 0px, #fff -2.96998px 0.42336px 0px, #fff -2.94502px -0.571704px 0px, #fff -2.59586px -1.50383px 0px, #fff -1.96093px -2.27041px 0px, #fff -1.11013px -2.78704px 0px, #fff -0.137119px -2.99686px 0px, #fff 0.850987px -2.87677px 0px, #fff 1.74541px -2.43999px 0px, #fff 2.44769px -1.73459px 0px, #fff 2.88051px -0.838246px 0px;\"><i class=\"fa fa-check-circle st-css-no\" aria-hidden=\"true\"><\/i>Key points<\/p><div class=\"st-in-mybox\">\n<ul>\n<li><span style=\"font-size: 120%;\">You can divide during the amendment period, within 30 days after a decision to grant, or within 3 months after the first decision of refusal.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">After grant, divide before the registration fee is paid; after refusal, the window follows the appeal-period extension for overseas applicants.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">A valid divisional keeps the parent&#8217;s filing date but not a new term.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Watch for the Article 50-2 notice and double patenting; examination must be requested separately.<\/span><\/li>\n<li><span style=\"font-size: 120%;\">Official fees apply again; a foreign-language divisional&#8217;s translation can be filed within 2 months of the divisional filing.<\/span><\/li>\n<\/ul>\n<\/div><\/div>\n<div style=\"background-color: #f0f7ff; border: 2px solid #0066cc; padding: 20px; margin: 24px 0; border-radius: 6px;\">\n<p><span style=\"font-size: 120%;\"><strong>Considering a divisional for your Japanese patent application?<\/strong><br \/>\nSend us your Japanese application number and the latest JPO decision \u2014 we will check the remaining window, suggest a divisional strategy and reply with a quote, free of charge.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">BrandAgent Patent Office (Kyoto, Japan)<br \/>\nToru Kano, Japanese Patent Attorney<\/span><\/p>\n<p><a style=\"color: #0066cc; font-weight: bold;\" href=\"https:\/\/brandagent.jp\/en\/home\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-size: 120%;\">Free consultation \u2014 visit BrandAgent&#8217;s English site<\/span><\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>When you can divide a Japanese patent application (Art. 44: amendment period, 30 days after grant, 3 months after refusal), uses, JPO fees, translations.<\/p>\n","protected":false},"author":1,"featured_media":397,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-380","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-patents"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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