Patent US2805941A successfully refreshed from Google Patents.
US2805941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recovering platinum
Assignee: Standard Oil Co
•
Filing: 1955-03-25
•
Granted: 1957-09-10
•
Expires: 1975-03-25
Abstract
No abstract record available.
Inventors
- 👤 Elton B Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:41
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/04; C22B11/042; C22B11/048; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE METHOD OF RECOVERING PLATINUM FROM A PLATINUMALUMINA COMPOSITE CONTAINING A SUBSTANTIAL PROPORTION OF GAMMA-TYPE ALUMINAS, WHICH COMPRISES IN COMBINATION THE STEPS OF CALCINING SAID COMPOSITE AT A TEMPERATURE ABOVE ABOUT 2000*F. FOR A TIME SUFFICIENT TO CONVERT SAID GAMMA-TYPE ALUMINAS SUBSTANTIALLY COMPLETELY INTO ALPHA ALUMINA, COOLING THE TREATED COMPOSITE, CONTACTING THE TREATED COMPOSITE WITH AQUA REGIA, WHEREBY PLATNUM IS SELECTIVELY DISSOLVED FROM SAID ALPHA ALUMINA, SEPARATING THE RESULTING PLATINUM SOLUTION FROM SAID ALPHA ALUMINA, AND RECOVERING PLATINUM FROM SAID SOLUTION.
Claim 2
Independent Claim
81 words
THE METHOD OF RECOVERING PLATINUM FROM A PLATINUMALUMINA COMPOSITE CONTAINING A SUBSTANTIAL PROPORTION OF GAMMA-TYPE ALUMINAS, WHICH COMPRISES IN COMBINATION THE STEPS OF CALCINING SAID COMPOSITE AT A TEMPERATURE ABOVE ABOUT 2000*F. FOR A TIME SUFFICIENT TO CONVERT SAID GAMMA-TYPE ALUMINAS SUBSTANTIALLY COMPLETELY INTO ALPHA ALUMINA, COOLING THE TREATED COMPOSITE, CONTACTING THE TREATED COMPOSITE WITH AQUA REGIA, WHEREBY PLATNUM IS SELECTIVELY DISSOLVED FROM SAID ALPHA ALUMINA, SEPARATING THE RESULTING PLATINUM SOLUTION FROM SAID ALPHA ALUMINA, AND RECOVERING PLATINUM FROM SAID SOLUTION.
References Cited (Backward Citations)
US2635080A
Cited
US2710799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |