Granted Patent
Utility
US 4,996,885 · App. 07/485,454
Differential pressure transmitter, a square root extractor
Inventor:
Clarence M. Asbill, III
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Feb 27, 1990
Inventor
Clarence M. Asbill, III
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.