公开(公告)号：US5041757A

公开(公告)日：1991-08-20

申请号：US632194

申请日：1990-12-21

Applicant: Robert T. Longo ,  Mario A. Barillas ,  Ralph Forman

Inventor： Robert T. Longo ,  Mario A. Barillas ,  Ralph Forman

IPC: C23C14/08 ,  C23C14/34 ,  C23C16/40 ,  H01J1/28 ,  H01J9/04

CPC classification number: H01J1/28 ,  H01J9/047

Abstract: A low work function surface for a dispenser cathode structure. The cathode structure comprising a heater and an electron emitting surface substrate or core composed of a porous tungsten matrix impregnated with a barium containing impregnant distributed therethrough. The structure is made by a method in which a nanometer thick layer of scandium oxide is sputtered onto the outermost surface of the impregnated tungsten core, or substrate, and then oxidized by exposing the sputtered scandium oxide surface layer to an oxygen atmosphere. The oxidized surface layer is activated by turning on the heater, for example, to cause the release of a small portion of the barium in the barium-containing impregnant. Some of the released barium migrates into the scandium oxide surface layer to form a monolayer of barium oxide on at least a portion thereof.

公开(公告)号：US3500995A

公开(公告)日：1970-03-17

申请号：US3500995D

申请日：1968-06-13

Applicant: MICHAEL RALPH FORMAN

Inventor： FORMAN MICHAEL RALPH

IPC: B42F7/06 ,  B65D85/00 ,  B65D1/34 ,  B65D85/02

CPC classification number: B42F7/06

公开(公告)号：US2828396A

公开(公告)日：1958-03-25

申请号：US46077854

申请日：1954-10-06

Applicant: RALPH FORMAN ,  BRECKENRIDGE ROBERT G

Inventor： RALPH FORMAN ,  BRECKENRIDGE ROBERT G

IPC: G05B1/02

CPC classification number: G05B1/02