Granted Patent
Utility
US 4,841,890 · App. 07/197,372
Thread break indicating device for sewing machines using a photo amplifier
Inventor:
Tibor L. Tancs
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: May 23, 1988
Inventor
Tibor L. Tancs
Assignee (at issue)
SSMC Inc.
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.