Granted Patent
Utility
US 5,446,142 · App. 08/074,537
Phthalocyanine and naphthalocyanine light-absorbing compound and optical recording medium containing same
Inventors:
Hisato Itoh, Takahisa Oguchi, Kenichi Sugimoto, Ryu Oi, Hideki Umehara, Shin Aihara
Patented Case
View Patent ↗
Granted: Aug 29, 1995
Filed: Jun 11, 1993
Inventors
Hisato Itoh
Takahisa Oguchi
Kenichi Sugimoto
Ryu Oi
Hideki Umehara
Shin Aihara
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.