Granted Patent
Utility
US 4,890,499 · App. 07/119,299
Fluid flow detectors
Inventor:
Murray F. Feller
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Nov 6, 1987
Inventor
Murray F. Feller
Assignee (at issue)
Model Screw Products, Inc.
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.