Granted Patent
Utility
US 5,001,031 · App. 07/251,379
Electrophotographic toner comprising a color agent and a mixture of vinyl polymers as a binder
Inventors:
Takashi Yamamoto, Masaaki Shin
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Sep 14, 1988
Inventors
Takashi Yamamoto
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.