Granted Patent
Utility
US 4,525,704 · App. 06/550,272
Enzymatic toxic gas sensor
Inventors:
Donald N. Campbell, John Schmidt
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Nov 9, 1983
Inventors
Donald N. Campbell
John Schmidt
Assignee (at issue)
ALLIED CONSULTING, 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.