Granted Patent
Utility
US 5,925,976 · App. 08/966,113
Cathode for electron tube having specific emissive material
Inventors:
Yoshiki Hayashida, Tetsuro Ozawa, Hiroshi Sakurai, Masaki Kawasaki
Patented Case
View Patent ↗
Granted: Jul 20, 1999
Filed: Nov 7, 1997
Inventors
Yoshiki Hayashida
Tetsuro Ozawa
Hiroshi Sakurai
Masaki Kawasaki
Assignee (at issue)
Matsushita Electronics 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.