Granted Patent
Utility
US 4,372,236 · App. 06/309,356
Thread cutting device for sewing machine
Inventor:
William Harrison
Patented Case
View Patent ↗
Granted: Feb 8, 1983
Filed: Oct 7, 1981
Inventor
William Harrison
Assignee (at issue)
Interco Incorporated
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.