What is the relationship between a judgment of no interference-in-fact and patent priority?
This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.
A judgment of no interference-in-fact is directly related to patent priority issues. As stated in MPEP 2308.03(b):
“A judgment of no interference-in-fact means that no interference is needed to resolve priority between the parties.”
This judgment indicates that there is no conflict in priority between the parties’ claims that requires resolution through an interference proceeding. In essence, it means that the claims of the parties do not overlap in a way that creates a priority dispute, making an interference proceeding unnecessary to determine who has the right to the invention.