Granted Patent
Utility
US 5,230,978 · App. 07/741,537
Electrophotographic toner composition
Inventors:
Shoji Kawasaki, Nobuhiro Hirayama, Kenji Uchiyama, Hisatomo Sato, Hiromi Akiyama
Patented Case
View Patent ↗
Granted: Jul 27, 1993
Filed: Aug 14, 1991
Inventors
Shoji Kawasaki
Nobuhiro Hirayama
Kenji Uchiyama
Hisatomo Sato
Hiromi Akiyama
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.