Granted Patent
Utility
US 4,553,075 · App. 06/520,154
Simple brushless DC fan motor with reversing field
Inventors:
Fred A. Brown, Alan F. Grouse
Patented Case
View Patent ↗
Granted: Nov 12, 1985
Filed: Aug 4, 1983
Inventors
Fred A. Brown
Alan F. Grouse
Assignee (at issue)
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.