Granted Patent
Utility
US 4,434,880 · App. 06/329,637
Handwheel clutch for sewing machines
Inventor:
Boleslaw Kornatowski
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Dec 11, 1981
Inventor
Boleslaw Kornatowski
Assignee (at issue)
The Singer Company Limited
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.