Granted Patent
Utility
US 4,336,867 · App. 06/080,809
Drum brake having duo mode
Inventor:
Ji Y. Woo
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Oct 1, 1979
Inventor
Ji Y. Woo
Assignee (at issue)
Bendix Limited
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.