Granted Patent
Utility
US 5,380,842 · App. 07/901,484
Phthalocyanine compounds and usage thereof
Inventors:
Hisato Itoh, Akio Karasawa, Kenichi Sugimoto, Takahisa Oguchi, Shin Aihara
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Jun 22, 1992
Inventors
Hisato Itoh
Akio Karasawa
Kenichi Sugimoto
Takahisa Oguchi
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.