Granted Patent
Utility
US 4,675,707 · App. 06/803,177
Thermally-responsive record material
Inventors:
Steven L. Vervacke, Thomas PETERSEN
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Dec 2, 1985
Inventors
Steven L. Vervacke
Thomas PETERSEN
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.