Granted Patent
Utility
US 4,656,553 · App. 06/821,059
Electronically programmable universal brushless DC fan with integral tracking and locked rotor protection
Inventor:
Fred A. Brown
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Jan 21, 1986
Inventor
Fred A. Brown
Assignee (at issue)
Comair Rotron 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.