An interference proceeding, also known as priority contest, is an inter partes proceeding to determine the priority issues of multiple patent applications. It is a unique patent law concept of the United States. Unlike most other countries that have adopted the first-to-file system, the first-to-invent system of the U.S. allows a party that failed to file a patent application on time to challenge the inventorship of another party that has a granted or pending patent if certain requirements are met.
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