Granted Patent
Utility
US 4,483,508 · App. 06/351,269
Gradient power valve assembly
Inventors:
Keith D. Marsh, Roy O. Erickson, Jr.
Patented Case
View Patent ↗
Granted: Nov 20, 1984
Filed: Feb 22, 1982
Inventors
Keith D. Marsh
Roy O. Erickson, Jr.
Assignee (at issue)
Colt Industries Operating Corporation
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.