Granted Patent
Utility
US 5,187,143 · App. 07/783,021
Heat sensitive recording material
Inventors:
Kazuo Watanabe, Tosaku Okamoto
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Oct 25, 1991
Inventors
Kazuo Watanabe
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.