Granted Patent
Utility
US 6,812,656 · App. 10/083,587
Sequenced pulse width modulation method and apparatus for controlling and powering a plurality of direct current motors
Inventors:
Frank Wegner Donnelly, Brian Ward Gulayets
Patented Case
View Patent ↗
Granted: Nov 2, 2004
Filed: Feb 27, 2002
Inventors
Frank Wegner Donnelly
Brian Ward Gulayets
Assignee (at issue)
Railpower Technologies Corp.
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.