Granted Patent
Utility
US 5,874,797 · App. 08/925,078
Permanent magnet generator providing alternating current which has a selected frequency
Inventor:
Joseph F. Pinkerton
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Sep 8, 1997
Inventor
Joseph F. Pinkerton
Assignee (at issue)
Active Power, 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.