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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.:

US 4078900 B1

PDFFull Text
Date of Patent:
Mar. 14, 1978

Filed:

Jun. 22, 1977

Method of making a high current density long life cathode

Applicant:
Inventors:

Bernard Smith, Neptune, NJ (US);

Albert F Newman, Spring Lake, NJ (US);

Assignee:

The United States of America as represented by the Secretary of the Army, Washington, DC (US);

Attorneys:

Edelberg; Nathan

Murray; Jeremiah G.

Gordon; Roy E.

Primary Examiner:

Richard B Lazarus

Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
29 2517 ;
Abstract

A high current density long life cathode for use in high power microwave e applications is made by: machining a porous tungsten pellet with copper in its pores to the desired cathode shape to form the emitting surface of the cathode and cleaning the porous pellet ultrasonically in trichloroethylene, then acetone, and then methanol; firing the tungsten pellet at about 1800.degree. C in a reducing atmosphere; etching the tungsten pellet ultrasonically in a solution of 50 parts of concentrated nitric acid in 50 parts of water; ultrasonically cleaning the tungsten pellet for about five minutes in an aqueous alkaline solution; cleaning the tungsten pellet in hot deionized water and then air drying the tungsten pellet in an oven for five minutes at about 150.degree. C; refiring the tungsten pellet in a reducing atmosphere at about 1800.degree. C; impregnating the porous tungsten pellet with a mixture of Ba.sub.3 WO.sub.6, Ba.sub.2 SrWO.sub.6 and ZrH.sub.2 in a nonreducing, nonoxidizing atmosphere at about 1900.degree. C to 2000.degree. C; and firing the impregnated tungsten pellet in a reducing atmosphere of dry hydrogen at about 1840.degree. C for about 2 to 5 minutes.

Find Patent Forward Citations

Smith, Bernard. (1978). Method of making a high current density long life cathode (U.S. Patent No. 4078900). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4078900

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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