US2769018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic oxidation of polynuclear hydrocarbons
Assignee: Wyeth Holdings LLC
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Filing: 1954-05-05
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Granted: 1956-10-30
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Expires: 1974-05-05
Abstract
No abstract record available.
Inventors
- 👤 Herbert J West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:07
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J23/38; B01J23/54; B01J23/66; B01J23/68; B01J23/682; B01J27/00; B01J27/02; B01J27/053; B01J27/055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A METHOD FOR THE VAPOR PHASE CATALYTIC OXIDATION OF ANTHRACENE TO ANTHRAQUINONE, THE STEP OF PASSING OF MIXTURE OF ANTHRACENE VAPOR AND AIR HAVING FROM ABOUT 0.4 TO ABOUT 4.8 MOLE PERCENT ANTHRACENE BY VOLUME THROUGH A MASS OF FLUIXIZED CATALYST MAINTAINED AT A TEMPERATURE OF FROM ABOUT 265* C. TO ABOUT 400* C., SAID CATALYST BEING COMPOSED OF FROM ABOUT 40% TO ABOUT 80% OF A CALCINED GEL OF SILICA IMPREGNATED UNIFORMLY WITH FROM ABOUT 20% TO ABOUT 60* OF A POTASSIUM SULFATE AND FROM ABOUT 2% TO ABOUT 25% OF A VANDIUM OXIDE, ALL PERCENTAGES BEING BASED ON THE CALCINED WEIGHT OF THE CATALYST.
Claim 2
Dependent Claim
107 words
IN A METHOD FOR THE VAPOR PHASE CATALYTIC OXIDATION OF ANTHRACENE TO ANTHRAQUINONE, THE STEP OF PASSING OF MIXTURE OF ANTHRACENE VAPOR AND AIR HAVING FROM ABOUT 0.4 TO ABOUT 4.8 MOLE PERCENT ANTHRACENE BY VOLUME THROUGH A MASS OF FLUIXIZED CATALYST MAINTAINED AT A TEMPERATURE OF FROM ABOUT 265* C. TO ABOUT 400* C., SAID CATALYST BEING COMPOSED OF FROM ABOUT 40% TO ABOUT 80% OF A CALCINED GEL OF SILICA IMPREGNATED UNIFORMLY WITH FROM ABOUT 20% TO ABOUT 60* OF A POTASSIUM SULFATE AND FROM ABOUT 2% TO ABOUT 25% OF A VANDIUM OXIDE, ALL PERCENTAGES BEING BASED ON THE CALCINED WEIGHT OF THE CATALYST.
References Cited (Backward Citations)
USRE16824E
Cited
US1694122A
Cited
US1886023A
Cited
US2027316A
Cited
US2471853A
Cited
US2698330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |