US3701629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of faujasite-type zeolites
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-08-04
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Granted: 1972-10-31
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Expires: 1991-08-04
Abstract
Abstract FAUJASITE-TYPE ZEOLITES HAVING HIGH SIO2/AL2O3 RATIOS ARE PREPARED BY THE ACIDIFICATION OF THE REACTION MIXTURE INTERMEDIATE AN INTIAL HOLDING PERIOD AND A SECOND HOLDING PERIOD. SUITABLE SOURCES OF SILICA INCLUDE SODIUM SILICATE, SILICA GEL, AND SILICIC ACID. CRYSTALLINE ALUMINOSILICATE ZEOLITES, SUCH AS CLINOPTILOLITE, MAY BE EMPLOYED AS SOURCES OF BOTH SILICA AND ALUMINA. A PROMOTER, SUCH AS SODIUM CHLORIDE, IS OPTIONALLY ADDED TO THE REACTION MIXTURE.
Inventors
- 👤 Dale D Maness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:03
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2838; C01B33/2853; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |