Granted Patent
Utility
US 4,729,339 · App. 06/854,305
Pressure differential indicator with non-mechanical thermal lockout
Inventor:
James C. Whiting
Patented Case
View Patent ↗
Granted: Mar 8, 1988
Filed: Apr 21, 1986
Inventor
James C. Whiting
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.