Granted Patent
Utility
US 4,713,939 · App. 06/867,850
Linear drive motor with symmetric magnetic fields for a cooling system
Inventor:
William Keith
Patented Case
View Patent ↗
Granted: Dec 22, 1987
Filed: May 23, 1986
Inventor
William Keith
Assignee (at issue)
Texas Instruments 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.