Granted Patent
Utility
US 4,285,989 · App. 06/038,049
Electrographic recording material, method of making and using
Inventors:
Walter J. Wilkinson, Irving Serlin
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: May 11, 1979
Inventors
Walter J. Wilkinson
Irving Serlin
Assignee (at issue)
Monsanto Company
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.