Granted Patent
Utility
US 4,426,952 · App. 06/232,485
Temperature compensated differential pressure indicating device
Inventor:
Robert L. Crisp, Jr.
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Feb 9, 1981
Inventor
Robert L. Crisp, Jr.
Assignee (at issue)
Facet Enterprises, Incorporated
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.