Granted Patent
Utility
US 6,528,115 · App. 09/502,531
Hard carbon thin film and method of forming the same
Inventors:
Hitoshi Hirano, Yoichi Domoto, Keiichi Kuramoto
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: Feb 10, 2000
Inventors
Hitoshi Hirano
Yoichi Domoto
Keiichi Kuramoto
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.