US3574538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing high silica faujasite
Assignee: WR Grace and Co
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Filing: 1968-10-17
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Granted: 1971-04-13
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Expires: 1988-10-17
Abstract
Abstract A PROCESS FOR PREPARING FAUJASITE HAVING A SILICAALUMINA RATIO ABOVE ABOUT 4.5 BY TREATING A MIXTURE OF CLAY, ALKALI METAL HYDROXIDE, ALKALI METAL SILICATE, AND NUCLEATION CENTERS (ZEOLITE SEEDS) AND HEATING TO CONVERT TO THE ZEOLITE DESIRED. THE INITIAL REACTANT MIXTURE MAY BE PREPARED TO HAVE A COMPOSITION EQUAL TO OR NEAR THAT OF THE DESIRED PRODUCT.
Inventors
- 👤 Carl Vance Mcdaniel He Duecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:16
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2838; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
Total Claims: 0
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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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |