Patent US3239471A successfully refreshed from Google Patents.
US3239471A
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US
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Pretreatment of pelleted zeolites to improve crushing strength
Assignee: Union Oil Company of California
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Filing: 1963-07-01
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Granted: 1966-03-08
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Expires: 1983-07-01
Abstract
No abstract record available.
Inventors
- 👤 Ch In Norman Chen-Hu
- 👤 Cloyd P Reeg
- 👤 Daniel M Waldorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:51
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PRETREATMENT METHOD FOR IMPROVING AND STABILIZING THE MECHANICAL STRENGTH OF A PELLETED, MOLECULAR SIEVE ALUMINO-SILICATE CRYSTALLINE ZEOLITE HAVING A SILICA/ALUMINA MOLE-RATIO BETWEEN ABOUT 2.5 AND 10, AND WHEREIN SAID PELLETS WERE INITIALLY PREPARED BY COMPRESSING INTO TABLES AN INCOMPLETELY HYDRATED, POWDERDERED, MICROCRYSSTALLINE AMMONIUM FORM OF SAID ZEOLITE, FOLLOWED BY A CALCINING OPERATION AT TEMPERATURES ABOVE 700*F. TO FORM A CORRESPONDING HYDROGEN ZEOLITE, WHICH COMPRISES: (1) REHYDRATING SAID CATALYST PELLETS TO A WATER CONTENT OF AT LEAST ABOUT 20% BY WEIGHT, (2) AMMONIATING SAID HYDRATED PELLETS TO SUBSTANTIAL SATURATION WITH GASEOUS AMMONIA, AND (3) RECALCINING THE AMMONIATED PELLETS AT A TEMPERATURE BETWEEN ABOUT 650* AND 1200*F. TO THEREBY IMPART ADDED MECHANCIAL STRENGTH AND STABILITY THERETO.
Claim 2
Dependent Claim
115 words
A PRETREATMENT METHOD FOR IMPROVING AND STABILIZING THE MECHANICAL STRENGTH OF A PELLETED, MOLECULAR SIEVE ALUMINO-SILICATE CRYSTALLINE ZEOLITE HAVING A SILICA/ALUMINA MOLE-RATIO BETWEEN ABOUT 2.5 AND 10, AND WHEREIN SAID PELLETS WERE INITIALLY PREPARED BY COMPRESSING INTO TABLES AN INCOMPLETELY HYDRATED, POWDERDERED, MICROCRYSSTALLINE AMMONIUM FORM OF SAID ZEOLITE, FOLLOWED BY A CALCINING OPERATION AT TEMPERATURES ABOVE 700*F. TO FORM A CORRESPONDING HYDROGEN ZEOLITE, WHICH COMPRISES: (1) REHYDRATING SAID CATALYST PELLETS TO A WATER CONTENT OF AT LEAST ABOUT 20% BY WEIGHT, (2) AMMONIATING SAID HYDRATED PELLETS TO SUBSTANTIAL SATURATION WITH GASEOUS AMMONIA, AND (3) RECALCINING THE AMMONIATED PELLETS AT A TEMPERATURE BETWEEN ABOUT 650* AND 1200*F. TO THEREBY IMPART ADDED MECHANCIAL STRENGTH AND STABILITY THERETO.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |