Granted Patent
Utility
US 5,266,434 · App. 07/730,900
Electrophotographic toner composition
Inventors:
Nobuhiro Hirayama, Kenji Uchiyama, Shoji Kawasaki, Hisatomo Sato, Hiromi Akiyama
Patented Case
View Patent ↗
Granted: Nov 30, 1993
Filed: Aug 6, 1991
Inventors
Nobuhiro Hirayama
Kenji Uchiyama
Shoji Kawasaki
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.