Granted Patent
Utility
US 4,798,781 · App. 06/891,178
Fabrication process of optical recording medium
Inventors:
Sumio Hirose, Hiroshi Ozawa, Kenji Abe, Yoichi Hosono
Patented Case
View Patent ↗
Granted: Jan 17, 1989
Filed: Jul 31, 1986
Inventors
Sumio Hirose
Hiroshi Ozawa
Kenji Abe
Yoichi Hosono
Assignees (at issue)
Mitsui Toatsu Chemicals, Incorporated
YAMAMOTO CHEMICALS, INC.
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.