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:
Aug. 24, 1993
Filed:
Dec. 20, 1991
Applicant:
Inventor:
Joseph M Morris, Lincoln, RI (US);
Assignee:
Praxair S.T. Technology, Inc., Danbury, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C / ; B01B / ;
U.S. Cl.
CPC ...
392389 ; 392388 ; 118726 ; 118696 ; 219425 ; 432-4 ; 432 44 ;
Abstract
A method of resistance heating using a graphite container having a graphite body and a pyrolytic boron nitride coating in which a metal charge of predetermined weight is deposited over the coating and the container is heated by the application of a variable source of electrical power to cause the metal charge to fully evaporate in a short interval of time of less than two minutes with the heat cycle controlled to provide a cool down period in each cycle of applied power and with a new metal charge introduced upon completion of each heat cycle in a semi-continuous fashion.