Granted Patent
Utility
US 4,285,290 · App. 06/071,156
Modular work trimmer for a sewing machine
Inventor:
Kenneth F. Kaltenbach
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Aug 30, 1979
Inventor
Kenneth F. Kaltenbach
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.