# US 12,180,574 B1 · Tarnish resistant and age hardenable sterling silver alloy

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,180,574 B1
- Document ID: US12180574B1
- Status: Granted
- Kind: B1
- Application number: 18/791,611
- Filed: 2024-08-01
- Granted: 2024-12-31
- Earliest claimed: 2024-08-01
- Assignees: National Chain Company; Enewton Design, LLC
- Applicants: Joseph Esposito; Grigory Raykhtsaum
- Inventors: Joseph Esposito; Grigory Raykhtsaum
- Web page: https://patentgrep.com/patent/US12180574B1

## CPC

- C22C 5/08: with copper as the next major constituent
- C22C 5/06: Alloys based on silver
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A sterling silver alloy composition consisting of in parts by weight: at least 92.5% silver, 0.5%-1.2% palladium, 3.4%-4.8% copper, 0.5%-1.5% zinc, 0.1%-1.5% indium, wherein zinc and indium combined content is not greater than 2.4%, 0.3%-1% germanium, and 0.005%-0.05% silicon.

## Claims

### Claim 1

A sterling silver alloy composition consisting of in parts by weight:
at least 92.5% silver,
0.5%-1.2% palladium,
3.4%-4.8% copper,
0.5%-1.5% zinc,
0.1%-1.5% indium,
wherein zinc and indium combined content is not greater than 2.4%,
0.3%-1% germanium,
and
0.005%-0.05% silicon.

### Claim 2 (depends on 1)

The composition of claim 1 wherein palladium and germanium combined content is not greater than about 1.5%.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the palladium content is about 1%.

### Claim 4 (depends on 1)

The composition of claim 1 wherein silicon content is about 0.035%.

### Claim 5 (depends on 2)

The composition of claim 2 wherein the palladium content is about 1%.

### Claim 6 (depends on 5)

The composition of claim 5 wherein the silicon is about 0.035%.