Granted Patent
Utility
US 4,603,921 · App. 06/741,646
Brake proportioning system
Inventor:
John V. Liggett
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Jun 6, 1985
Inventor
John V. Liggett
Assignee (at issue)
Rockwell International Corporation
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.