Granted Patent
Utility
US 4,887,643 · App. 06/353,272
Pilot actuated spool valve
Inventors:
Jerry B. Tomlin, Ingo Olejak
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Mar 1, 1982
Inventors
Jerry B. Tomlin
Ingo Olejak
Assignee (at issue)
Koomey, 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.