Granted Patent
Utility
US 4,401,012 · App. 06/270,731
Piston for disc brakes
Inventor:
John E. Emmett
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Jun 5, 1981
Inventor
John E. Emmett
Assignee (at issue)
Occidental Chemical 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.