Granted Patent
Utility
US 4,870,047 · App. 07/239,493
Thermally-responsive record material
Inventors:
Kenneth D. Glanz, Gerald C. Bartman
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Sep 1, 1988
Inventors
Kenneth D. Glanz
Gerald C. Bartman
Assignee (at issue)
Appleton Papers Inc.
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.