Granted Patent
Utility
US 4,981,923 · App. 07/359,217
Resins for toner of electrophotography and method for manufacturing the same
Inventors:
Kazuo Hagiwara, Akira Misawa, Kazuo Hisamatsu, Masaaki Shin
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: May 31, 1989
Inventors
Kazuo Hagiwara
Akira Misawa
Kazuo Hisamatsu
Masaaki Shin
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.