Granted Patent
Utility
US 4,326,474 · App. 06/259,718
In-place bobbin winding mechanism for a sewing machine
Inventor:
Thaddeus J. Zylbert
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: May 1, 1981
Inventor
Thaddeus J. Zylbert
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.