Granted Patent
Utility
US 4,413,581 · App. 06/482,743
Optical switching arrangement for a sewing machine
Inventor:
William W. Logan
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: Apr 7, 1983
Inventor
William W. Logan
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.