Granted Patent
Utility
US 4,659,643 · App. 06/789,710
Heat-sensitive recording diazo material with recording sensitizer
Inventors:
Katsuhiko Ishida, Masaharu Nojima, Tosaku Okamoto
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Oct 21, 1985
Inventors
Katsuhiko Ishida
Masaharu Nojima
Tosaku Okamoto
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.