Interference proceeding

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An interference proceeding, also known as a priority contest, is an inter partes proceeding to determine the priority issues of multiple patent applications. Until the Leahy-Smith America Invents Act of 2011, it was a unique procedure in the patent law of the United States. Unlike in most other countries which had a first-to-file system, the former first-to-invent system of the U.S. allowed a party which has failed to file a patent application on time to challenge the inventorship of another party which had a granted or pending patent, if certain requirements were met.



An interference proceeding is an administrative proceeding conducted by a panel of administrative patent judges (administrative law judges sitting on the Board of Patent Appeals and Interferences) of the United States Patent and Trademark Office (USPTO) to determine which applicant is not entitled to the patent if both claimed the same invention in:

  1. two or more pending patent applications, or
  2. at least one pending patent application and at least one patent issued within a year of the pending application's filing date.

A panel, composed of judges on the Board of Patent Appeals and Interferences, a quasi-judicial body in the USPTO, hears an interference contest. Its final judgment adjudicating one party as an earlier inventor is called a priority award, or simply an award. Appeals from this tribunal are heard before either the United States Court of Appeals for the Federal Circuit or the United States District Court for the District of Columbia. See 35 U.S.C.   § 144, 35 U.S.C.   § 146.


At least two parties are involved in an interference proceeding: the inventor(s) or applicant(s) who filed an earlier patent application are called the "senior party", and the other inventor(s) or applicant(s) are called the "junior party". Both parties can be referred as "contestants", but that term is currently more likely to be used to describe the junior party.


Presumptions are stated in 37 C.F.R. 41.207(a):

(1) Order of invention. Parties are presumed to have invented interfering subject matter in the order of the dates of their accorded benefit for each count. If two parties are accorded the benefit of the same earliest date of constructive reduction to practice, then neither party is entitled to a presumption of priority with respect to the other such party.
(2) Evidentiary standard. Priority may be proved by a preponderance of the evidence, except a party must prove priority by clear and convincing evidence if the date of its earliest constructive reduction to practice is after the issue date of an involved patent or the publication date under 35 U.S.C. 122(b) of an involved application or patent.

Leahy-Smith America Invents Act

On September 16, 2011, President Obama signed the Leahy-Smith America Invents Act into law. Part of the Act changed the U.S. patent system from a first-to-invent system to a first-to-file system. [1] As such, interference proceedings were eliminated from U.S. patent law. More specifically, any patent application with an effective filing date on or after March 16, 2013, cannot initiate an interference. [2] Derivation proceedings are replacing interference proceedings in the patent statutes, but the dispute surrounding a derivation proceeding is unrelated to that of an interference proceeding.

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