Granted Patent
Utility
US 4,241,141 · App. 06/021,748
Removable coatings which prevent penetration from felt tip marking inks
Inventor:
Douglas W. Dill
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Mar 19, 1979
Inventor
Douglas W. Dill
Assignee (at issue)
S. C. JOHNSON & SON, 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.