US3830738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of particulate solids
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-06-15
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Granted: 1974-08-20
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Expires: 1992-06-15
Abstract
Abstract THERE IS PROVIDED A FIRE FIGHTING FOAM COMPATIBLE FIRE FIGHTING POWDER COMPOSITION COMPOSED OF AN ALKALINE FIRE-EXTINGUISHING POOWDER FROM 1% TO 5% OF A PARTIALLY HYDROPHOBIC POWDERED SILICA HAVING A SURFACE AREA OF AT LEAST 10 SQUARE METERS PER GRAM AND CARRYING A SURFACE TREATMENT WITH A SILANE; THE SILANE HAS A HYDROPHOBIC GROUP WHICH IS NON-REACTIVE TO THE SILANOL GROUP ON THE SILICA SURFACE AND A FURTHER GROUP ON THE SILANE IS REACTIVE TO THE SILANOL GROUPS ON THE SILCA SURFACE. SUITABLY, THE HYDROPHOBIC GROUP CAN BE ALKYL AND THE REACTIVE GROUP CAN BE CHLORINE. THE DEGREE OF HYDROPHOBICITY MEASURED BY THE METHANOL TITRATION TEST IS IN THE RANGE OF 5 TO 35.
Inventors
- 👤 A Cottrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:33
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; A; A62; A62D; A62D1/00; A62D1/0007; A62D1/0014; B; B01; B01J; B01J2/00; B01J2/30; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/20; C01P2006/22; C01P2006/80; C01P2006/82; C01P2006/90; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |