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:
Jun. 18, 2002
Filed:
Aug. 22, 2001
Applicant:
Inventors:
Dwarika P. Agarwal, Attleboro, MA (US);
Grigory Raykhtsaum, Sharon, MA (US);
Assignee:
Leach & Garner Company, North Attleboro, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
C22C 5/00 ;
U.S. Cl.
CPC ...
C22C 5/00 ;
Abstract
An improved 18-karat green gold alloy composition comprises about 75.0% gold; about 6.0-7.0% silver; about 9.0-11.7% copper; and about 6.5-9.0% zinc. The improved alloys are capable of being age-hardened to a hardness of about 240 VHN by being heated to about 550° F. for about one hour, and thereafter being permitted to cool in air. The hard-nesses of the alloys are reversible between their aged-hardness and annealed-hardness values. The color of said composition is between about −1.5 to about −3.0 CieLab a* color units, and between about 19 to about 26 CieLab b* color units.