Granted Patent
Utility
US 4,144,644 · App. 05/697,201
Modular selector valve assembly
Inventor:
Robert A. Olsen
Patented Case
View Patent ↗
Granted: Mar 20, 1979
Filed: Jun 17, 1976
Inventor
Robert A. Olsen
Assignee (at issue)
American Hospital Supply Corp.
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.