Granted Patent
Utility
US 4,480,260 · App. 06/452,281
Color-developing sheet for pressure-sensitive recording sheets
Inventors:
Noboru Yamato, Akira Hasegawa, Hiroaki Umeda, Mamoru Suzuki
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Dec 22, 1982
Inventors
Noboru Yamato
Akira Hasegawa
Hiroaki Umeda
Mamoru Suzuki
Assignee (at issue)
Jujo Paper 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.