Granted Patent
Utility
US 4,263,500 · App. 06/036,940
Infrared heating hair dryer
Inventors:
William E. Springer, Henry J. Walter
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: May 7, 1979
Inventors
William E. Springer
Henry J. Walter
Assignee (at issue)
Clairol Incorporated
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.