Granted Patent
Utility
US 6,124,702 · App. 09/190,944
Step switch cycloconverter utilizing multi-tap armature
Inventors:
Joseph F. Pinkerton, David B. Clifton
Patented Case
View Patent ↗
Granted: Sep 26, 2000
Filed: Nov 13, 1998
Inventors
Joseph F. Pinkerton
David B. Clifton
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.