Granted Patent
Utility
US 6,208,056 · App. 08/925,937
Cartridge armatures for electro-dynamic machines
Inventor:
David Perkins
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Sep 8, 1997
Inventor
David Perkins
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.