Granted Patent
Utility
US 4,245,577 · App. 06/033,297
Lockstitch sewing by needle looper
Inventor:
Josef Zocher
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Apr 25, 1979
Inventor
Josef Zocher
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.