Attempting to patent an invention that is an obvious variation of another invention by the same inventor when the first invention has already been patented or has a pending patent application.
• Double patenting is grounds for rejecting a patent application, limiting the term of a patent through a terminal disclaimer, or invalidating a patent. In re Longi, 225 USPQ 645 (Fed. Cir. 1985). A double-patenting challenge can be overcome by filing a terminal disclaimer.
— Also termed obviousness-type double patenting.