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:
May. 09, 1989
Filed:
Mar. 01, 1988
Applicant:
Inventors:
Sara H Anderson, Westmont, IL (US);
Jocelyne McGeever, LaGrange, IL (US);
Casey McGeever, LaGrange, IL (US);
Greg Carr, Indianapolis, IN (US);
Assignee:
Liquid Air Corporation, Walnut Creek, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75 96 ;
Abstract
Inert liquid gas such as liquid nitrogen or liquid argon is used in vertical melting furnaces to prevent oxidation of the metal during holding periods. The method can be applied to any kind of metal. The use of inert liquid gas for the 'blow-dow' of the furnace will flush art all existing furnace atmosphere and prevent oxidation. The casting recovery time may be reduced from about one hour to 15 minutes. Also the layers of oxide resulting from oxidation can be negated, allowing for fewer rejects, if any, during further surface treatment.