Granted Patent
Utility
US 4,901,621 · App. 07/079,291
Superconducting projectile for a rail gun and the combination of a rail gun with a superconducting projectile
Inventor:
Derek A. Tidman
Patented Case
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Granted: Feb 20, 1990
Filed: Jul 9, 1987
Inventor
Derek A. Tidman
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.