Granted Patent
Utility
US 6,308,639 · App. 09/558,376
Hybrid battery/gas turbine locomotive
Inventors:
Frank Wegner Donnelly, Gerard Henry Koldyk
Patented Case
View Patent ↗
Granted: Oct 30, 2001
Filed: Apr 26, 2000
Inventors
Frank Wegner Donnelly
Gerard Henry Koldyk
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.