Granted Patent
Utility
US 5,240,897 · App. 07/612,751
Heat-sensitive recording material
Inventors:
Rosalinde Braun, Rudolf Zink
Patented Case
View Patent ↗
Granted: Aug 31, 1993
Filed: Nov 13, 1990
Inventors
Rosalinde Braun
Rudolf Zink
Assignee (at issue)
Ciba-Geigy
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.