Granted Patent
Utility
US 4,388,760 · App. 06/326,970
Marking device
Inventor:
Robert M. Aspy
Patented Case
View Patent ↗
Granted: Jun 21, 1983
Filed: Dec 3, 1981
Inventor
Robert M. Aspy
Assignee (at issue)
CONGOLEUM 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.