Granted Patent
Utility
US 4,322,708 · App. 06/196,943
Electromagnetic device utilizing a pair of magnetically activated electronic switches
Inventors:
Kenneth H. Oehrig, Frank J. Petkewicz
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: Oct 14, 1980
Inventors
Kenneth H. Oehrig
Frank J. Petkewicz
Assignee (at issue)
GTE Automatic Electric Labs 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.