Granted Patent
Utility
US 4,664,997 · App. 06/782,473
Crystalline oxytitanium phthalocyanine and photoreceptor for use in electrophotography
Inventors:
Tetsumi Suzuki, Tetsuo Murayama, Hitoshi Ono, Shigenori Otsuka, Mamoru Nozomi
Patented Case
View Patent ↗
Granted: May 12, 1987
Filed: Oct 1, 1985
Inventors
Tetsumi Suzuki
Tetsuo Murayama
Hitoshi Ono
Shigenori Otsuka
Mamoru Nozomi
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
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.