US3769006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bright cast alloy, and composition
Assignee: GOLD REFINING W CO
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Filing: 1972-01-27
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Granted: 1973-10-30
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Expires: 1992-01-27
Abstract
Abstract An improved gold alloy casting composition wherein sufficient aluminum and/or silicon is utilized in an amount sufficient to form a lustrous oxidation resistant surface coating during and after casting, the method of casting utilizing these components and the cast product. In addition a de-oxidant may also be utilized.
Inventors
- 👤 C Ingersoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:27
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
The composition of claim 1 wherein there is additionally present about 0.04 percent by weight, based on the composition, of chromium.
Claim 2
Dependent Claim
11 words
The composition of claim 1 wherein said hardening element is copper.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein said hardening element is iron.
Claim 4
Dependent Claim
19 words
The composition of claim 1 further including a deoxidant selected from the group consisting of zinc, magnesium, and barium.
Claim 5
Dependent Claim
23 words
The composition of claim 1 wherein both tin and indium are utilized in a combined amount of 3 to 6 percent by weight.
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |