Granted Patent
Utility
US 5,646,273 · App. 08/531,059
Phthalocyanine compound and optical recording medium containing it
Inventors:
Takahisa Oguchi, Hideki Umehara, Kenichi Sugimoto, Ryu Oi, Hisato Itoh
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Sep 20, 1995
Inventors
Takahisa Oguchi
Hideki Umehara
Kenichi Sugimoto
Ryu Oi
Hisato Itoh
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.