Patent US2665970A successfully refreshed from Google Patents.
US2665970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precipitation of vanadium oxides
Assignee: National Research Council Canada
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Filing: 1952-12-26
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Granted: 1954-01-12
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Expires: 1972-12-26
Abstract
No abstract record available.
Inventors
- 👤 Halpern Jack
- 👤 Frank A Forward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:48
CPC Classifications
C; C01; C01G; C01G31/00; C01G31/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF EXTRACTING VANADIUM OXIDE FROM AQUEOUS SOLUTIONS CONTAINING IT IN PENTAVALENT FORM WHICH COMPRISES HEATING THE SOLUTION IN A CLOSED REACTION ZONE IN THE PRESENCE OF A HYDROGENATION CATALYST AND HYDROGEN UNDER A POSTIVE PARTIAL PRESSURE OF AT LEAST THREE POUNDS PER SQUARE INCH AT A TEMPERATURE OF 125 TO 400* F. TO PRECIPITATE THE VANADIUM OXIDE.
Claim 2
Independent Claim
59 words
A METHOD OF EXTRACTING VANADIUM OXIDE FROM AQUEOUS SOLUTIONS CONTAINING IT IN PENTAVALENT FORM WHICH COMPRISES HEATING THE SOLUTION IN A CLOSED REACTION ZONE IN THE PRESENCE OF A HYDROGENATION CATALYST AND HYDROGEN UNDER A POSTIVE PARTIAL PRESSURE OF AT LEAST THREE POUNDS PER SQUARE INCH AT A TEMPERATURE OF 125 TO 400* F. TO PRECIPITATE THE VANADIUM OXIDE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |