Granted Patent
Utility
US 4,777,251 · App. 07/043,047
Process for preparing oxytitanium phthalocyanine
Inventors:
Motoaki Tanaka, Tutomu Miyagawa, Iwao Takagishi
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Apr 27, 1987
Inventors
Motoaki Tanaka
Tutomu Miyagawa
Iwao Takagishi
Assignees (at issue)
Mitsubishi Kasei Corporation
Waco Pure Chemical Industries
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.