US3811876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver alloys having high sulphuration resistance
Assignee: Suwa Seikosha KK
•
Filing: 1972-07-13
•
Granted: 1974-05-21
•
Expires: 1992-07-13
Abstract
Abstract Tarnish-resistant silver alloys which retain the malleability and silver-white appearance of the pure metal containing tin, indium and zinc in specified concentration ranges. These elements are synergistic in their effects. Small quantities of Ti, Zn, Be, Cr, Si, Al, Ge and Sb when used in addition to Sn, In and Zn further increase resistance to tarnishing by sulphur-containing materials.
Inventors
- 👤 H Harigaya
- 👤 K Kasai
- 👤 M Asahina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:35
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A tarnish-resistant, easily workable silver-base alloy having the characteristic appearance of pure silver consisting essentially of 4-10% of Sn, 0.5-12% of In, 0.1-5% of Zn by weight and at least one member of the group consisting of Ti, Zr, Be and Cr wherein the total quantity of said member or members is in the range of .001 to 1 percent by weight, the remainder of said silver-base alloy being silver.
Claim 2
Dependent Claim
67 words
A tarnish-resistant, easily workable silver-base alloy having the characteristic appearance of pure silvEr consisting essentially of 4-10% of Sn, 0.5-12% of In, 0.1-5% of Zn by weight, and at least one member of the group consisting of Sb, Al and Ge, wherein the total quantity of said member or members is in the range of 0.001-5 percent by weight, the remainder of said silver-base alloy being silver.
Claim 3
Dependent Claim
99 words
A tarnish-resistant, easily workable silver-base alloy having the characteristic appearance of pure silver consisting essentially of 4-10% of Sn, 0.5-12% of In, 0.1-5% of Zn by weight, at least one member of the group consisting of Sb, Al and Ge, wherein the total quantity of said member or members is in the range of 0.001-5 percent by weight, and at least one member of the group consisting of Ti, Zr, Be and Cr wherein the total quantity of said member or members is in the range of .001-1 percent by weight, the remainder of said silver-base alloy being silver.
Claim 4
Dependent Claim
74 words
a tarnish-resistant, easily workable silver-base alloy having the characteristic appearance of pure silver consisting essentially of 4-10% of Sn, 0.5-12% of In, 0.1-5% of Zn by weight, containing 0.001-10% of Cu by weight and at least one member of the group consisting of Ti, Zr, Be and Cr wherein the total quantity of said member or members is in the range of .001-1 percent by weight, the remainder of said silver-base alloy being silver.
Claim 5
Dependent Claim
69 words
A tarnish-resistant, easily workable silver-base alloy having the characteristic appearance of pure silver consisting essentially of 4-10% of Sn, 0.5-12% of In, 0.1-5% of Zn by weight, containing 0.001-10% of Cu by weight, and at least one member of the group consisting of Sb, Al and Ge, wherein the total quantity of said member or members is in the range of 0.001-5 percent by weight, the remainder being silver.
Claim 6
Dependent Claim
104 words
A tarnish-resistant, easily workable silver-base alloy having the characteristic appearance of pure silver consisting essentially of 4-10% of Sn, 0.5-12% of In, 0.1-5% of Zn by weight, containing 0.001-10% of Cu by weight and at least one member of the group consisting of Sb, Al and Ge wherein the total quantity of said member or members is in the range of 0.001-5 percent by weight, and at least one member of the group consisting of Ti, Zr, Be and Cr, wherein the total quantity of said member or members is in the range of .001 to 1 percent by weight, the remainder being silver.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |