US3671191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of high silica synthetic faujasite
Assignee: WR Grace and Co Conn
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Filing: 1970-09-16
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Granted: 1972-06-20
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Expires: 1990-09-16
Abstract
Abstract HIGH SILICA CRYSTALLINE ALUMINOSILICATES ARE PREPARED BY FORMING AS AQUEOUS REACTION MIXTURE WITH SOURCES OF SODIUM HYDROXIDE, SILICA, ALUMINA, AND NUCLEATION CENTERS (SEEDS), A PORTION OF THE EXCESS SODIUM HYDROXIDE BEING NEUTRALIZED BY THE ADDITION OF A STRONG MINERAL ACID OR AMMONIUM SULFATE, AND CRYSTALLIZING THE REACTION MIXTURE AT AN ELEVATED TEMPERATURE. SODIUM SILICATE SOLUTION CAN BE USED AS THE SILICA OUNCE. PARTICAL NEUTRALIZATION OF THE SODIUM SILICATE SOLUTION WITH A STRONG MINERAL ACID SUCH AS SULFURIC ACID PREVENTS EXCESS SOLUBILAZATON OF THE SILICA AND THEREBY INCREASES THE SILICA TO ALUMINA RATIO IN THE FINAL PRODUCT.
Inventors
- 👤 Philip Kenerick Maher
- 👤 Edwin Wolf Albers
- 👤 Carl Vance Mcdaniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:31
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |