US3696053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous silica containing foreign ions and method for preparation for same
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1970-03-18
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Granted: 1972-10-03
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Expires: 1990-03-18
Abstract
Abstract THIS INVENTION IS ADDRESSED TO SILICA GEL GRAINS CONTAINING FOREIGN IONS INCLUDING AN ALALI METAL CATION, WHEREIN THE ALKALI METAL IS SELECTED FROM A GROUP CONSISTING OF LITHIUM, SODIUM, POTASSIUM AND CERSIUM, ALONG WITH AN ACIDIC ANION SELECTED FROM A GROUP CONSISTING OF SULFATE, PHOSPHATE, CHLORIDE, BROMIDE AND IODIDE ANIONS, AND TO METHODS FOR THEIR PREPARATION.
Inventors
- 👤 Madeleine A Le Page
- 👤 Raymond Beau
- 👤 Jacques Duchene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:23
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |