Granted Patent
Utility
US 4,453,779 · App. 06/349,882
Adjustable variable load control valve device
Inventor:
Robert J. Bridigum
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Feb 18, 1982
Inventor
Robert J. Bridigum
Assignee (at issue)
American Standard 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.