Patent US3332771A successfully refreshed from Google Patents.
US3332771A
Expired / Lapsed
US
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Recovery of platinum metals
Assignee: Individual
•
Filing: 1964-07-30
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Granted: 1967-07-25
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Expires: 1984-07-30
Abstract
No abstract record available.
Inventors
- 👤 Henry M Heidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:47
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/006; C22B7/007; C22B11/00; C22B11/04; C22B60/00; C22B60/02; C22B60/0204; C22B60/0208; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR THE RECOVERY OF PLATINUM METALS FROM MATERIALS CONTAINING SAME THEREIN WHICH COMPRISES THE STEPS OF CONTACTING SAID MATERIAL WITH A STRONG OXIDIZING AGENT TO DISSOLVE A PORTION OF SAID PLATINUM METAL AND RENDER THE REMAINING PLATINUM METAL SUBSTANTIALLY STABLE WHEN SUBSEQUENTLY HEATED, AND THEREAFTER PERFORMING AN ALKALINE FUSION ON SAID STABILIZED PLATINUM METAL THEREBY OXIDIZING SAID PLATINUM METAL TO THE WATER SOLUBLE SULFATE, AND SEPARATELY RECOVERING SAID PLATINUM METAL.
Claim 2
Dependent Claim
72 words
A PROCESS FOR THE RECOVERY OF PLATINUM METALS FROM MATERIALS CONTAINING SAME THEREIN WHICH COMPRISES THE STEPS OF CONTACTING SAID MATERIAL WITH A STRONG OXIDIZING AGENT TO DISSOLVE A PORTION OF SAID PLATINUM METAL AND RENDER THE REMAINING PLATINUM METAL SUBSTANTIALLY STABLE WHEN SUBSEQUENTLY HEATED, AND THEREAFTER PERFORMING AN ALKALINE FUSION ON SAID STABILIZED PLATINUM METAL THEREBY OXIDIZING SAID PLATINUM METAL TO THE WATER SOLUBLE SULFATE, AND SEPARATELY RECOVERING SAID PLATINUM METAL.
References Cited (Backward Citations)
GB289220A
Cited
GB316063A
Cited
US1876943A
Cited
GB495262A
Cited
US3166404A
Cited
US3238038A
Cited
US9786752B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |