Granted Patent
Utility
US 4,176,071 · App. 05/919,166
Corrosion inhibitor mixture for ammonium sulfate fire-retardant compositions and method for inhibiting corrosivity of such compositions
Inventor:
Robert L. Crouch
Patented Case
View Patent ↗
Granted: Nov 27, 1979
Filed: Jun 26, 1978
Inventor
Robert L. Crouch
Assignee (at issue)
Early California Industries, 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.