Granted Patent
Utility
US 5,084,368 · App. 07/320,239
Electrophotographic toner
Inventors:
Nobuhiro Hirayama, Masaaki Shin, Shoji Kawasaki, Akira Misawa, Akio Fujiwara, Kenji Uchiyama
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Feb 24, 1989
Inventors
Nobuhiro Hirayama
Masaaki Shin
Shoji Kawasaki
Akira Misawa
Akio Fujiwara
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.