Granted Patent
Utility
US 4,886,319 · App. 07/277,804
Low hysteresis proportioner valve
Inventors:
David L. Nies, Tomas L. Shroyer
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Nov 30, 1988
Inventors
David L. Nies
Tomas L. Shroyer
Assignee (at issue)
General Motors LLC
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.