Granted Patent
Utility
US 4,247,299 · App. 05/916,488
Non-conductive polar gas sensing element and detection system
Inventors:
Carl F. Klein, Paul E. Thoma
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Jun 19, 1978
Inventors
Carl F. Klein
Paul E. Thoma
Assignee (at issue)
Johnson Controls, 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.