Granted Patent
Utility
US 4,431,450 · App. 06/348,309
Desensitizing ink for pressure sensitive copying sheets
Inventors:
Akira Hasegawa, Mamoru Suzuki
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Feb 12, 1982
Inventors
Akira Hasegawa
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.