US3824191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing silicates of high porosity and silicates obtained by said process
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1972-01-19
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Granted: 1974-07-16
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Expires: 1992-01-19
Abstract
Abstract NOVEL PROCESSES, COMPOSITIONS (OF THE TYPE OF THE RESULTING PRODUCT), AND USES THEREOFOR; CONCERNING FORMATION OF EXFOLIATED VERMICULITE FROM COMMERCIAL VERMICU LITE BY SUCCESSIVE TREATMENTS WITH A SALINE SOLUTION, WITH WATER, AND WITH AN ACID FOLLOWED BY WASHING WITH WATER UNTIL NEUTRAL, RESULTING IN AN EXPANDED PRODUCT HAVING A GREATLY INCREASED SPECIFIC SURFACE, PORE VOLUME, AND AVERAGE PORE RADIUS (THE VALUES OF WHICH CAN BE SUBSTANTIALLY CONTROLLED TO GIVE A DESIRED TAYLOR-MADE PRODUCT BY VARIATION OF THE TIME, HEAT, CONCENTRATION, PRESSURE AND LIKE PARAMETERS), THE USEFULNESS OF SAID PRODUCTS INCLUD ING THAT OF A DESIECANT.
Inventors
- 👤 R Wey
- 👤 P Guisen
- 👤 Dred R Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:19
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/20; C04B14/206; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; Y; Y10; Y10S; Y10S106/00; Y10S106/03
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |