Patent US2704281A successfully refreshed from Google Patents.
US2704281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of noble metal-metal oxide composite
Assignee: Universal Oil Products Co
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Filing: 1953-04-30
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Granted: 1955-03-15
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Expires: 1973-04-30
Abstract
No abstract record available.
Inventors
- 👤 Herbert R Appell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:16
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A METHOD OF PURIFYING A COMPOSITE OF A NOBLE METAL AND A METAL OXIDE AND CONTAINING METAL IMPURITIES WHICH COMPRISES TREATING SAID COMPOSITE WITH CONCENTRATED ACID TO DISSOLVE SAID IMPURITIES IN THE ACID WITHOUT SUBSTANTIAL DISSOLVING OF THE NOBLE METAL AND METAL OXIDE, AND WASHING AND CALCINING THE THUS TREATED COMPOSITE.
Claim 2
Independent Claim
51 words
A METHOD OF PURIFYING A COMPOSITE OF A NOBLE METAL AND A METAL OXIDE AND CONTAINING METAL IMPURITIES WHICH COMPRISES TREATING SAID COMPOSITE WITH CONCENTRATED ACID TO DISSOLVE SAID IMPURITIES IN THE ACID WITHOUT SUBSTANTIAL DISSOLVING OF THE NOBLE METAL AND METAL OXIDE, AND WASHING AND CALCINING THE THUS TREATED COMPOSITE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-14 | 1958-09-13 | 1959-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-14 | 1962-09-13 | 1963-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-14 | 1966-09-13 | 1967-03-15 | $7700.00 | Window Closed / Lapsed |