Granted Patent
Utility
US 4,998,087 · App. 07/391,255
Pressure or temperature responsive switch having temperature gradient between sensor and electrical output
Inventor:
Henry J. Boulanger
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Aug 9, 1989
Inventor
Henry J. Boulanger
Assignee (at issue)
Texas Instruments 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.