The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 1981
Filed:
Nov. 20, 1979
Toshiyuki Aida, Chofu, JP;
Shigehiko Yamamoto, Tokorozawa, JP;
Sadanori Taguchi, Tokyo, JP;
Isamu Yuito, Ome, JP;
Yukio Honda, Fuchu, JP;
Ushio Kawabe, Tokyo, JP;
Akira Misumi, Mobara, JP;
Takao Kawamura, Chiba, JP;
Hiroshi Fukushima, Chiba, JP;
Yoshio Degawa, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electron tube cathode has a composite suppression layer structure interposed between the base metal and the electron-emitting material to suppress an interface layer formed through the reaction of the base metal with the electron emissive material. The composite layer structure includes a thin layer of Pt or Re and a layer of oxide of Zr and/or Hf. As a result, the formation of the interface layer is prevented so that the useful life of the electron tube cathode is prolonged.