US2680696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of esterifying the surface of a silica substrate having a reactive silanol surface
Assignee: EIDP Inc
•
Filing: 1951-02-14
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Granted: 1954-06-08
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Expires: 1971-02-14
Abstract
No abstract record available.
Inventors
- 👤 Edward C Broge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:40
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158; C01B33/1585; B; B82; B82Y; B82Y30/00; C01B33/159; C01B33/18; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/80; C01P2006/90; Y; Y10; Y10S; Y10S516/00; Y10S516/924; Y10S516/928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A PROCESS FOR MAKING SILICEOUS SOLIDS HYDROPHOBIC, THE STEPS COMPRISING HEATING, IN A CLOSED SYSTEM AT A PRESSURE OF 2,000 T 20,000 POUNDS PER SQUARE INCH AND A TEMPERATURE OF 270 TO 375* C., AN INORGANIC SILICEOUS MATERIAL HAVING A SPECIFIC SURFACE AREA GREATER THAN ONE SQUARE METER PER GRAM AND HAVING A HYDROPHILIC SURFACE CONTAINING A MULTIPLICITY OF SURFACE SILANOL GROUPS, IN AN ORGANIC ALCOHOL MIXTURE WHICH IN THE ABSENCE OF THE ALCOHOL HAS A PH OF 4.5 TO 7.5 AND WHICH COMPRISES THE ALCOHOL AND WATER IN A WEIGHT RATIO OF FROM 2.33:1 TO 19:1, THE ALCOHOL BEING SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY MONOHYDRIC ALCOHOLS HAVING FROM 2 TO 18 CARBON ATOMS, AND WHILE MAINTAINING THE TEMPERATURE IN THE RANGE FROM 270 TO 375* C., REDUCING THE PRESSURE SUBSTANTIALLY TO ATMOSPHERIC BY VENTING VAPORS FROM THE SYSTEM.
Claim 2
Dependent Claim
144 words
IN A PROCESS FOR MAKING SILICEOUS SOLIDS HYDROPHOBIC, THE STEPS COMPRISING HEATING, IN A CLOSED SYSTEM AT A PRESSURE OF 2,000 T 20,000 POUNDS PER SQUARE INCH AND A TEMPERATURE OF 270 TO 375* C., AN INORGANIC SILICEOUS MATERIAL HAVING A SPECIFIC SURFACE AREA GREATER THAN ONE SQUARE METER PER GRAM AND HAVING A HYDROPHILIC SURFACE CONTAINING A MULTIPLICITY OF SURFACE SILANOL GROUPS, IN AN ORGANIC ALCOHOL MIXTURE WHICH IN THE ABSENCE OF THE ALCOHOL HAS A PH OF 4.5 TO 7.5 AND WHICH COMPRISES THE ALCOHOL AND WATER IN A WEIGHT RATIO OF FROM 2.33:1 TO 19:1, THE ALCOHOL BEING SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY MONOHYDRIC ALCOHOLS HAVING FROM 2 TO 18 CARBON ATOMS, AND WHILE MAINTAINING THE TEMPERATURE IN THE RANGE FROM 270 TO 375* C., REDUCING THE PRESSURE SUBSTANTIALLY TO ATMOSPHERIC BY VENTING VAPORS FROM THE SYSTEM.
References Cited (Backward Citations)
US2249767A
Cited
US2285449A
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US2375738A
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US2454941A
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US2438379A
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US2509026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |