Granted Patent
Utility
US 4,657,837 · App. 06/800,081
Toner for developing an electrostatically charged image
Inventors:
Hideaki Morita, Takahira Kasuya, Goichi Yamakawa, Makoto Tomono, Shinichiro Yasuda
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Nov 6, 1985
Inventors
Hideaki Morita
Takahira Kasuya
Goichi Yamakawa
Makoto Tomono
Shinichiro Yasuda
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
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.