Granted Patent
Utility
US 4,833,057 · App. 07/110,695
Toner composition for the electrophotography
Inventors:
Akira Misawa, Hisatomo Sato, Keiichi Ishikawa, Masaaki Shin, Akio Fujiwara, Kazuo Hisamatsu, Shoji Kawasaki, Kenji Uchiyama
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Sep 22, 1987
Inventors
Akira Misawa
Hisatomo Sato
Keiichi Ishikawa
Masaaki Shin
Akio Fujiwara
Kazuo Hisamatsu
Shoji Kawasaki
Kenji Uchiyama
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.