US3755538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of zeolites
Assignee: WR Grace and Co
•
Filing: 1971-10-08
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Granted: 1973-08-28
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Expires: 1991-10-08
Abstract
Abstract CRYSTALLINE ZEOLITES ARE PREPARED BY REACTING PRECURSOR MIXTURES OF SILICA, ALUMINA, ALKALI METAL, HYDROXIDE AND WATER TO WHICH HAVE BEEN ADDED A MINOR QUANTITY OF A COMPOSITION WHICH IS HIGHLY ACTIVE FOR INITIATION OF CRYSTALLIZATION OF THE DESIRED ZEOLITE FROM THE PRECURSOR REACTION MIXTURE. THE COMPOSITION WHICH IS HIGHLY ACTIVE FOR THE PRODUCTION OF ZEOLITES COMPRISES A REACTED AQUEOUS SLURRY OF ALKALI METAL HYDROXIDE, ALUMINA, SILICA, WATER AND A MINOR QUANTITY OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF BORON, VANADIUM, PHOSPHORUS, MOLYBDENUM, TUNGSTEN, GERMANIUM, GALLIUM, AND MIXTURES THEREOF.
Inventors
- 👤 E Albers
- 👤 G Edwards
- 👤 D Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:34
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2884; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; C01B33/2838; C01B33/2892; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
Total Claims: 0
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |