Granted Patent
Utility
US 4,421,041 · App. 06/309,296
Needle design and clamping system
Inventor:
William Weisz
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Oct 7, 1981
Inventor
William Weisz
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.