Granted Patent
Utility
US 4,691,968 · App. 06/831,891
Dual circuit brake valve
Inventors:
James G. Pugh, Duane R. Johnson, Roy E. Bartholomew
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Feb 24, 1986
Inventors
James G. Pugh
Duane R. Johnson
Roy E. Bartholomew
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.