Granted Patent
Utility
US 5,230,606 · App. 07/935,285
Electric fan with hot air/cold air dual-mode control
Inventor:
Ke Chin-Fu
Patented Case
View Patent ↗
Granted: Jul 27, 1993
Filed: Aug 26, 1992
Inventor
Ke Chin-Fu
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.