Granted Patent
Utility
US 5,723,948 · App. 08/724,863
Helix travelling-wave tube with a maximum small signal gain at the operating voltage
Inventor:
Mitsuru Yoshida
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: Oct 3, 1996
Inventor
Mitsuru Yoshida
Assignee (at issue)
NEC CORPORATION
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.