Granted Patent
Utility
US 4,864,869 · App. 07/141,369
Flowmeter with faraday effect optical switch readout
Inventor:
William M. Glasheen
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Jan 4, 1988
Inventor
William M. Glasheen
Assignee (at issue)
General Electric Company
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.