Inventors Eye
April 20100

The USPTO's bimonthly publication for the independent inventor community

Provisional Application for Patent, with United States Patent and Trademark Office Seal

The Provisional Patent Application:
What You Need to Know

A provisional patent application (PPA) is a patent application that can be used by a patent applicant to secure a filing date while avoiding the costs associated with the filing and prosecution of a nonprovisional patent application. More specifically, if a nonprovisional application is filed within one year from the filing date of a PPA, the nonprovisional application may claim the benefit of the filing date of the PPA. (Why filing dates for patent applications are important will be discussed below.) Because a PPA is not examined, an applicant can also avoid the costs typically associated with nonprovisional patent prosecution (certain attorney's fees, for example) for a year while determining whether his/her invention is commercially viable. Further, because a PPA is not made public unless its application number is noted in a later-published application or patent, the failure by an applicant to file a nonprovisional application based on his/her PPA will not lead to public disclosure of his/her invention.

What are  the benefits of filing a PPA?

A PPA essentially provides a one-year extension as to the filing of a U.S. nonprovisional patent application.  In doing so, a PPA provides an applicant with an additional year to experiment, perfect an invention, find financial backers, determine sales potential, find interested parties for licensing, etc. before filing his/her nonprovisional application.  Because a PPA is not examined, an applicant can also avoid the costs associated with prosecuting a nonprovisional application during this one-year period.

What are the possible pitfalls of filing a PPA?

There are no extensions on the one-year time limit for filing a nonprovisional application claiming benefit of a PPA filing date.  (see proposed change below)  By law, either you file a nonprovisional application within a year or you lose the benefit of the filing date. Importantly, most other countries usually base the time for filing a nonprovisional application in their countries on the PPA filing date. This means that an international or foreign application may need to be filed at the same time that a nonprovisional application claiming benefit of a PPA is filed in the U.S.  Further, if the PPA does not adequately describe all that is claimed in the later-filed nonprovisional application, then the material added in the nonprovisional application may not rely on the PPA filing date. This could affect patentability if a reference disclosing the later-described invention is published after the filing date of the PPA but prior to the filing date of a nonprovisional application.

What are the minimum filing requirements for a PPA?

A PPA requires a coversheet (form SB/16 available at, a written description that meets the requirements of 35 USC 112, first paragraph, drawings as necessary, and a fee submitted within the prescribed time limit.  The written description should provide enough detail that would allow someone having ordinary skill in the same technology, the ability to make and use the invention.  A PPA must disclose enough information that a person having ordinary skill in the same technology would recognize that the invention claimed in a later-filed nonprovisional application is described in the PPA upon which it relies. 

Why are filing dates important?

Filing dates set the date for constructive reduction to practice (i.e., the date upon which the invention is disclosed to a patent office as having been made), and in doing so, determine the date against which the invention will be tested for novelty and non-obviousness.  How?  Unless an inventor files evidence that his/her invention was actually made earlier than an application filing date, the filing date serves as the date before which publications, public use, and sales may serve as "prior art" against the invention.  "Prior art" is used by patent offices, including the USPTO, to determine whether an invention is new and non-obvious.  Thus, applicants want to secure the earliest filing date possible for their inventions to avoid the most prior art.  Importantly, public disclosure of an invention in foreign countries may occur during the one-year period after the filing of a PPA in the USPTO.  It is, therefore, important to understand how foreign patent offices determine when a public disclosure is made, to ensure that intellectual property rights are not lost in those countries.

Why do PPAs exist?

On June 8, 1995 the Uruguay Round Agreement Act was signed, which allowed countries to provide domestic priority for patent applications.  This act provided U.S. patent applicants the same rights as applicants who file in other countries.  It also established the statutory requirement that a nonprovisional patent application must be filed within the one-year period in order to maintain the PPA priority date.

Here are some facts you need to know about PPAs.

  1. A PPA expires after one year.
  2. You cannot extend a PPA.
  3. You cannot renew a PPA.
  4. A PPA will never become a patent.
  5. You cannot file a PPA for a design .
  6. The USPTO does not examine PPAs .
  7. The USPTO does not conduct a prior art .search on PPAs
  8. The USPTO does review PPAs to make sure they meet minimum filing requirements.
  9. PPAs are not published by the USPTO (unless claimed as priority in a later-issued or published nonprovisional application).
  10. You can use the term "patent pending" for the duration of the one-year pendency of a PPA.

Proposed changes

The USPTO is considering a change that would effectively provide a 12-month extension to the 12-month PPA period.  If adopted, this change would be implemented through the missing parts practice in nonprovisional patent applications.  The nonprovisional application, therefore, would still need to be filed within 12 months after the date on which the corresponding provisional application was filed.  

We are very interested in your comments on the proposed change in provisional practice. The instructions for submitting comments are in the Federal Register Notice, Request for Comments on Proposed Change to Missing Parts Practice, found at

by John Calvert : United States Patent and Trademark Office Inventors Assistance Program

in this issue
The National Inventors Hall of Fame
Sixteen new members inducted
By Jeff Look : Public Affairs
Provisional Patent Applications:
What You Need to Know

By John Calvert : Inventors Assistance Program
Spark of Genius
Simon Says: Invent.
By Jeff Look : Public Affairs
Special Status?
Where Independent Inventors Meet
Organizations for Inventors


past issues


What does the USPTO do
for independent inventors?