US2736668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of methoxylating the surface of a siliceous material, and the resulting product
Assignee: EIDP Inc
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Filing: 1952-05-09
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Granted: 1956-02-28
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Expires: 1972-05-09
Abstract
No abstract record available.
Inventors
- 👤 Edward C Broge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:07
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C08; C08K; C08K9/00; C08K9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A COMPOSITION CONSISTING OF A SUBSTRATE HAVING METHOXY GROUPS CHEMICALLY BONDED TO ITS SURFACE, THE SUBSTRATE CONSISTING OF A PLURALITY OF DENSE ULTIMATE UNITS OF AMORPHOUS SILICA COHERENTLY JOINED INTO PURVERULENT, SUPERCOLLOIDAL AGGREGATES HAVING A SPECIFIC SURFACE AREA OF AT LEAST ONE SQUARE METER PER GRAM, THE PROPORTION OF METHOXY GROUPS BEING AT LEAST 400 PER HUNDRED SQUARE MILLIMICRONS OF SURFACE AREA OF SAID INTERNAL STRUCTURE.
Claim 2
Dependent Claim
112 words
IN A PROCESS FOR METHOXYLATING THE SURFACE OF A SILICEOUS MATERIAL THE STEPS COMPRISING EFFECTING CONTACT BETWEEN METHANOL AND AN INORGANIC, SUPERCOLLOIDAL, SILICEOUS MATERIAL HAVING A SPECIFIC SURFACE AREA OF AT LEAST ONE SQUARE METER PER GRAM AND HAVING SURFACE SILANOL GROUPS, AND HEATING THE MIXTURE AT A TEMPERATURE OF ABOUT FROM 150 TO 300* C. WHILE MAINTAINING THE WATER CONTENT OF THE SYSTEM INITIALLY BELOW 1% AND FINALLY BELOW 0.1% BY WEIGHT, WHEREBY CHEMICAL COMBINATION OF METHOXY GROUPS WITH THE SILICEOUS MATERIAL IS EFFECTED, AND CONTINUING THE HEATING UNTIL THE PROPORTION OF COMBINED METHOXY GROUPS IS AT LEAST 400 PER 100 SQUARE MILLIMICRONS OF SURFACE AREA OF THE ORIGINAL SILICEOUS MATERIAL.
References Cited (Backward Citations)
US2657149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |