Granted Patent
Utility
US 6,787,997 · App. 10/300,821
Linear-beam microwave tube
Inventor:
Shintaro Arai
Patented Case
View Patent ↗
Granted: Sep 7, 2004
Filed: Nov 21, 2002
Inventor
Shintaro Arai
Assignee (at issue)
NEC Microwave Tube, Ltd.
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.