Granted Patent
Utility
US 4,273,418 · App. 06/098,939
Mirror for producing optical illusions
Inventors:
Richard L. Gillespie, Douglas A. Geller
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Nov 30, 1979
Inventors
Richard L. Gillespie
Douglas A. Geller
Assignee (at issue)
Wham-O-Mfg. Co.
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.