Granted Patent
Utility
US 4,976,286 · App. 07/452,918
Four-way slide valve
Inventors:
Peter A. Holborow, Gary Kramer
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Dec 14, 1989
Inventors
Peter A. Holborow
Gary Kramer
Assignee (at issue)
Automatic Switch Company
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.