Granted Patent
Utility
US 6,067,429 · App. 09/305,221
Friction material and braking device and image forming apparatus using the friction material
Inventors:
Tomio Sugaya, Hidehisa Okamura
Patented Case
View Patent ↗
Granted: May 23, 2000
Filed: May 5, 1999
Inventors
Tomio Sugaya
Hidehisa Okamura
Assignee (at issue)
Hitachi Koki Co., Ltd.
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.