# US 8,785,035 B2 · Composition for manufacturing contacts, and contacts and connector using same

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- Number: US 8,785,035 B2
- Document ID: US8785035B2
- Status: Granted
- Kind: B2
- Application number: 13/322,083
- Filed: 2011-03-04
- Published: 2012-03-29
- Granted: 2014-07-22
- Earliest claimed: 2010-03-11
- Assignees: OMRON Corporation
- Applicants: Kuniyoshi Maezawa; Yoko Ishikawa
- Inventors: Kuniyoshi Maezawa; Yoko Ishikawa
- Web page: https://patentgrep.com/patent/US8785035B2

## CPC

- C22C 19/03: based on nickel
- C22C 19/07: based on cobalt
- C25D 1/04: Wires; Strips; Foils
- C25D 3/562: {containing more than 50% by weight of iron or nickel or cobalt}
- C25D 5/50: by heat-treatment
- H01R 13/03: characterised by the material, e.g. plating, or coating materials
- H01R 13/2421: {using coil springs}
- Y10T 428/12014: having metal particles
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A composition for making a contact contains predetermined amounts of cobalt and sulfur and has a predetermined average particle size. The composition for making the contact includes a nickel-cobalt alloy containing 20% by weight to 55% by weight of cobalt, and 0.002 part by weight to 0.02 part by weight of sulfur with respect to 100 parts by weight of the nickel-cobalt alloy, the composition having an average particle size of 0.10 μm to 0.35 μm. The contact made with the composition may be included in a connector.

## Claims

### Claim 1

A contact comprising:
a retaining section fixed by an insulator;
a contact section that makes sliding contact with a conductive member; and
an elastic deformation section that connects the retaining section and the contact section to each other, and that is elastically deformable,
at least the elastic deformation section containing a composition for making the contact, the composition including:
a nickel-cobalt alloy containing 20% by weight to 55% by weight of cobalt; and
0.002 part by weight to 0.02 part by weight of sulfur with respect to 100 parts by weight of the nickel-cobalt alloy,
the composition having an average particle size of 0.14 μm to 0.35 μm.

### Claim 2 (depends on 1)

The contact as set forth in claim 1, wherein the composition has an average particle size of 0.23 μm to 0.35 μm.

### Claim 3 (depends on 1)

The contact as set forth in claim 1, wherein the composition contained in the contact is one obtained by heat-treating an electroformed layer made by electroforming.

### Claim 4 (depends on 1)

The contact as set forth in claim 1, wherein the composition contained in the contact is one obtained by heat-treating, at 180 to 350° C. for 1 to 48 hours, an electroformed layer made by electroforming.

### Claim 5 (depends on 1)

A connector comprising a contact as set forth in claim 1.

### Claim 6 (depends on 5)

The connector as set forth in claim 5, said connector being a battery connector.

### Claim 7 (depends on 1)

A method for making a contact as set forth in claim 1, the method comprising a step of heat-treating an electroformed layer made by electroforming.