US3767391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tarnish resistant alloy
Assignee: J F JELENKO & Co 99 BUSINESS PARK DRIVE ARMONK NEW YORK 10504
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Filing: 1969-05-19
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Granted: 1973-10-23
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Expires: 1989-05-19
Abstract
Abstract A tarnish-resistant alloy, especially useful in the presence of sulfur and sulfur-containing environments, comprising 39 to 47 weight percent gold, 9 to 12 weight percent palladium, and the balance silver and copper wherein the silver-to-copper weight ratio is from 1:1 to 1.5:1.
Inventors
- 👤 J Tuccillo
- 👤 J Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:21
CPC Classifications
C; C22; C22C; C22C5/00; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
35 words
An alloy according to claim 1 wherein the gold content is about 40% to 42%, palladium content is 9% to about 10% and the ratio of silver to copper is about 1.2:1 to about 1.4:1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |