Granted Patent
Utility
US 4,612,821 · App. 06/461,827
Spring system for push-button control in a sewing machine
Inventor:
William Weisz
Patented Case
View Patent ↗
Granted: Sep 23, 1986
Filed: Jan 28, 1983
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.