Granted Patent
Utility
US 4,287,283 · App. 05/882,101
Iron powder developing carrier and the manufacturing method of the same, developer containing said carrier and method of forming visible image by using said developer
Inventors:
Shotaro Watanabe, Makoto Tomono, Goichi Yamakawa, Takeo Nishimura, Nobuo Takahashi
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Feb 28, 1978
Inventors
Shotaro Watanabe
Makoto Tomono
Goichi Yamakawa
Takeo Nishimura
Nobuo Takahashi
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.