Granted Patent
Utility
US 5,132,153 · App. 07/456,645
Optical recording media
Inventors:
Sumio Hirose, Shigeru Takahara, Tadashi Koike, Shin Aihara, Keiji Ueno
Patented Case
View Patent ↗
Granted: Jul 21, 1992
Filed: Dec 27, 1989
Inventors
Sumio Hirose
Shigeru Takahara
Tadashi Koike
Shin Aihara
Keiji Ueno
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.