Hamilton M Solidum

US Patent:

50513176, Sep 24, 1991

Filed:

Jan 3, 1990

Appl. No.:

7/460359

Inventors:

Hamilton Solidum - Dayton NJ

Assignee:

Krementz & Co. Inc. - Newark NJ

International Classification:

B32B 1501
B32B 1520
C25D 510
C25D 512

US Classification:

428671

Abstract:

Disclosed herein is a process for the electrodepositing multiple layers of fine gold and bright nickel upon a substrate layer. Fine gold is defined as being 99. 99% pure. By insulating bright nickel between layers of fine gold, the galvanic effect is substantially reduced. This process is uniquely suited to jewelry products, where the substrate layers are ordinarily composed of brass.

US Patent:

39350053, Jan 27, 1976

Filed:

Sep 19, 1974

Appl. No.:

5/507333

Inventors:

Hamilton M. Solidum - North Attleboro MA
Robert G. Zobbi - Southbury CT

Assignee:

American Chemical & Refining Company, Incorporated - Waterbury CT

International Classification:

C09K 1300
C23F 304

US Classification:

75105

Abstract:

A dry powder composition for stripping gold and silver contains 78. 0-95. 0 percent of a soluble cyanide compound, 0. 01-5. 0 percent of a soluble lithium compound, 0. 01-0. 5 percent of a soluble lead or bismuth compound as an auxiliary agent, and 5. 0-22. 0 percent of a water soluble ring-substituted nitrobenzene acid compound. The nitrobenzene acid compounds are selected from the group consisting of the alkali metal and ammonium salts of methyl-nitrobenzoic acid, chloro-nitrobenzoic acid and amino nitrobenzoic acid and of chloro-nitrobenzenesulfonamides. In using the composition, 7. 5-60. 0 grams per liter of the dry powder composition is dissolved inwater and the resultant aqueous solution is maintained at a temperature of 18. degree. -55. degree. Centigrade. The solution may be replenished as the stripping rate decreases by addition of further amounts of the dry powder composition.