Granted Patent
Utility
US 4,766,054 · App. 06/868,630
Optical recording medium
Inventors:
Sumio Hirose, Hiroshi Ozawa, Kenji Abe, Yoichi Hosono
Patented Case
View Patent ↗
Granted: Aug 23, 1988
Filed: May 29, 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.