Granted Patent
Utility
US 4,647,757 · App. 06/728,723
Hair dryer heater section providing uniform outlet air temperature distribution
Inventor:
Henrik Haastrup
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Apr 30, 1985
Inventor
Henrik Haastrup
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.