Granted Patent
Utility
US 4,878,385 · App. 07/151,557
Differential pressure sensing apparatus
Inventor:
Sheldon G. Lloyd
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Feb 2, 1988
Inventor
Sheldon G. Lloyd
Assignee (at issue)
Fisher Controls International LLC
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.