Granted Patent
Utility
US 4,263,995 · App. 05/883,156
Electromagnetic spring clutch
Inventor:
Robert L. Wahlstedt
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Mar 3, 1978
Inventor
Robert L. Wahlstedt
Assignee (at issue)
Reell Precision Manufacturing Corporation
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.