Granted Patent
Utility
US 4,439,610 · App. 05/774,613
Process for preparing triarylmethane derivatives
Inventors:
Mitsuru Kondo, Kiyoshi Yasui, Makoto Miyake, Hiroshi Iwasaki, Tetsuo Shiraishi
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Mar 4, 1977
Inventors
Mitsuru Kondo
Kiyoshi Yasui
Makoto Miyake
Hiroshi Iwasaki
Tetsuo Shiraishi
Assignee (at issue)
Kanzaki Paper Manufacturing 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.