Granted Patent
Utility
US 4,246,318 · App. 06/028,630
Thermally-responsive record material
Inventor:
Henry Baum
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Apr 9, 1979
Inventor
Henry Baum
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.