Granted Patent
Utility
US 4,850,651 · App. 07/240,644
Proportioning brake control valve with caged tare pressure spring
Inventor:
Bruce E. Latvala
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Sep 6, 1988
Inventor
Bruce E. Latvala
Assignee (at issue)
AlliedSignal, 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.