Granted Patent
Utility
US 6,572,936 · App. 09/433,077
Hard carbon film-coated substrate and method for fabricating the same
Inventors:
Yoichi Domoto, Hitoshi Hirano, Keiichi Kuramoto, Seiichi Kiyama
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Nov 3, 1999
Inventors
Yoichi Domoto
Hitoshi Hirano
Keiichi Kuramoto
Seiichi Kiyama
Assignee (at issue)
SANYO ELECTRIC 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.