Granted Patent
Utility
US 5,843,571 · App. 08/772,135
Amorphous hard carbon film
Inventor:
Kentaro Sho
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Dec 20, 1996
Inventor
Kentaro Sho
Assignee (at issue)
Zexel GmbH
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.