Granted Patent
Utility
US 4,546,639 · App. 06/535,796
Thread rolling dies for forming self tapping screws and the like
Inventor:
Richard H. Corrette
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: Sep 26, 1983
Inventor
Richard H. Corrette
Assignee (at issue)
Colt Industries Operating 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.