Granted Patent
Utility
US 4,254,971 · App. 06/046,811
Pressure-sensitive record material and preparation thereof
Inventor:
Peter A. H. Isaac
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Jun 8, 1979
Inventor
Peter A. H. Isaac
Assignee (at issue)
Engelhard Minerals & Chemicals Corporation
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.