Granted Patent
Utility
US 4,820,683 · App. 07/128,857
Thermally-responsive record material
Inventors:
Steven L. Vervacke, Kenneth D. Glanz
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Dec 4, 1987
Inventors
Steven L. Vervacke
Kenneth D. Glanz
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.