Granted Patent
Utility
US 4,355,590 · App. 06/243,412
Variable bobbin thread control for lockstitch looptaker
Inventor:
Stanley J. Ketterer
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Mar 13, 1981
Inventor
Stanley J. Ketterer
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.