Granted Patent
Utility
US 5,032,470 · App. 07/508,698
Optical recording medium with an aluminum alloy metallic layer containing at least hafnium
Inventors:
Kiyotaka Shindo, Koichi Igarashi, Kunihiko Mizumoto, Hidehiko Hashimoto
Patented Case
View Patent ↗
Granted: Jul 16, 1991
Filed: Apr 13, 1990
Inventors
Kiyotaka Shindo
Koichi Igarashi
Kunihiko Mizumoto
Hidehiko Hashimoto
Assignee (at issue)
Mitsui Petrochemical Industries, 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.