Granted Patent
Utility
US 4,926,697 · App. 07/297,665
Differential pressure transmitter, a square root extracting device therefor and methods of making the same
Inventor:
George T. Hardin
Patented Case
View Patent ↗
Granted: May 22, 1990
Filed: Jan 13, 1989
Inventor
George T. Hardin
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.