by: Joseph Page
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Continuation Application

One patent application continues from another

Continuation Patent Application
Related Topics: Application , Provisional Application

Continuation applications

     Patent applications sometimes split into ‘continuing applications’ – or applications which depend from earlier filed applications. A continuing application may result from many of various circumstance, but always depends from a parent application. The two (or more) applications can be prosecuted simultaneously, or one may be issued or abandon while the other continues prosecution. In many cases, a continuation application will have an identical disclosure with respect to the parent application including description and drawings while having a separate claims set. In this way, many claims may be granted on the same description – and those claims sets may each have a separate examination, examiner, and patentability argument. Since, a continuation application may have assigned the same or different patent examiner, the examination process may be very different from the parent application.


     A ‘divisional’ type patent application is in effect a continuation application. When a single patent application is reviewed by a patent examiner, and that patent application appears to include two distinct patentable concepts, a patent examiner sometimes forces a ‘divisional’ application upon the applicant. Two separate classes of claims are declared and each are prosecuted under independent cover. The final result will be two (or more) patents – one patent each for each patentably distinct claims set. A divisional application comes at the insistence of the patent office, while other forms of continuation come via the request of the applicant.


     Sometimes, when a patent application is already filed and new additional concepts follow or new important description supports earlier presented patentable concepts, then a ‘continuation--in-part’ patent application may be the correct form of a continuation patent application. In a continuation-in-part application, a new specification or modifications to the old specification include new matter not presented in the earlier filed patent application. New matter is strictly not allowed in a continuation application. The filing date of the continuation-in-part application is the original filing date for the originally disclosed matter, but the later filing date for the new matter. Matter introduced late does not gain the benefit of the earlier date.

Limits on Continuation Practice

     The patent office very nearly set limits on the number on continuation applications that could be filed. However, at an ‘11th hour’ decision, the commissioner withdrew rules directed as such limits under threat of litigation. It was strongly argued that the commissioner does not have the right to limit the number of applications an applicant wishes to bring. Congress has this power, however the commissioner cannot make rules inconsistent with law set forth by congress. Presently, we are allowed to file as many continuation applications as desired by the applicant.

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Patent Services Header Intellectual Property Patent Agent, patent attorney, patent law Patent Topic: "Continuation Patent Application" Patent Attorney Invention HOME IP Tip: #10
Sometimes the essence of an invention only comes out during the course of writing a patent application.  As the application is prepared, we often ask 'what if this element were [alternate]…?' which leads to alternate versions and even altogether new inventions.  It is not necessary to wait until an idea is firmly defined and rigorously developed prior to initiating a patent application – indeed, it is often better to being the patent application early.  In this way, the patent practitioner and engineering staff working together can produce excellent results both engineering and intellectual property. Patent Attorney, Patent law Initiating an Application
Patent Attorney, patent agent, patent law, inventions
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