Granted Patent
Utility
US 4,974,487 · App. 07/252,551
Plasma propulsion apparatus and method
Inventors:
Yeshayahu S. A. Goldstein, Derek A. Tidman, Rodney L. Burton, Dennis W. Massey, Niels K. Winsor
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Oct 3, 1988
Inventors
Yeshayahu S. A. Goldstein
Derek A. Tidman
Rodney L. Burton
Dennis W. Massey
Niels K. Winsor
Assignee (at issue)
GT-Devices
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.