Granted Patent
Utility
US 4,434,734 · App. 06/235,467
Anti-spill device for sewing machine bobbin
Inventor:
Angus R. T. Russell
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Feb 18, 1981
Inventor
Angus R. T. Russell
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.