Granted Patent
Utility
US 4,874,005 · App. 07/281,125
Current to pressure tranducer employing magnetic fluid
Inventor:
Robert I. Potter
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Dec 7, 1988
Inventor
Robert I. Potter
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.