Granted Patent
Utility
US 4,236,307 · App. 05/956,884
Method of making a nitrogen dioxide sensing element
Inventors:
Jeannine O. Colla, Paul E. Thoma
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Nov 2, 1978
Inventors
Jeannine O. Colla
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.