Granted Patent
Utility
US 4,660,894 · App. 06/848,015
Proportioning brake valve with dual area secondary piston
Inventors:
Roy E. Bartholomew, Milan J. Sebo
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Apr 3, 1986
Inventors
Roy E. Bartholomew
Milan J. Sebo
Assignee (at issue)
ALLIED CONSULTING, 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.