Granted Patent
Utility
US 4,893,878 · App. 07/249,682
Inline proportioning valve for brake systems
Inventors:
Joe S. Cole, Jack D. Hutcheson
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Sep 27, 1988
Inventors
Joe S. Cole
Jack D. Hutcheson
Assignee (at issue)
Hilite Industries, 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.