Granted Patent
Utility
US 5,693,396 · App. 08/753,173
Phthalocyanine compounds and optical recording media comprising them
Inventors:
Tsutami Misawa, Kenichi Sugimoto, Taizo Nishimoto, Takeshi Tsuda, Keisuke Takuma
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Nov 20, 1996
Inventors
Tsutami Misawa
Kenichi Sugimoto
Taizo Nishimoto
Takeshi Tsuda
Keisuke Takuma
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.