Granted Patent
Utility
US 4,882,310 · App. 07/253,862
Heat-sensitive recording material with heat-sensitive color developing layer containing prismatic calcium carbonate
Inventors:
Naoto Arai, Masaharu Nojima, Ritsuo Mandoh
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Oct 5, 1988
Inventors
Naoto Arai
Masaharu Nojima
Ritsuo Mandoh
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.