Granted Patent
Utility
US 5,220,010 · App. 07/813,179
Method for preparation alkoxyphthalocyanine
Inventors:
Takahisa Oguchi, Kenichi Sugimoto, Shin Athara, Hisato Itoh, Mansuke Matsumoto, Toshihiro Masaoka, Masakazu Nakamura
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Dec 24, 1991
Inventors
Takahisa Oguchi
Kenichi Sugimoto
Shin Athara
Hisato Itoh
Mansuke Matsumoto
Toshihiro Masaoka
Masakazu Nakamura
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.