Granted Patent
Utility
US 4,982,637 · App. 07/419,876
Rotary cutting apparatus
Inventor:
Paul V. Osborn
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Oct 11, 1989
Inventor
Paul V. Osborn
Assignee (at issue)
Mobil Oil Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.