Patent US2279886A successfully refreshed from Google Patents.
US2866716A
Expired / Lapsed
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Process for modifying the surface of a silica substrate having a reactive silanol surface
Assignee: EIDP Inc
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Filing: 1955-10-18
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Granted: 1958-12-30
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Expires: 1975-10-18
Abstract
No abstract record available.
Inventors
- 👤 Edward C Broge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:09
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/025; C01; C01B; C01B33/00; C01B33/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS COMPRISING ACTIVATING AN INORGANIC, SUPERCOLLOIDAL SILICEOUS SOLID HAVING A SURFACE CONSISTING ESSENTIALLY OF SILICA CONTAINING SURFACE SILANOL GROUPS BUT SUBSTANTIALLY NO SURFACE BOUND ALUMINUM, BY HEATING IT TO A TEMPERATURE IN THE RANGE FROM 300 TO 700*C. UNTIL ITS SPECIFIC HYDROXYLATED SURFACE AREA IS REDUCED TO LESS THAN 85 PERCENT OF ITS SPECIFIC SURFACE AREA BUT NOT BELOW THE POINT WHERE THERE ARE ABOUT 2 SURFACE SILANOL GROUPS PER SQUARE MILLIMICRON OF SURFACE, AND THEREAFTER EFFECTING CONTACT BETWEEN IT AND A TERMINALLY-UNSATURATED HYDROCARBON, WHEREBY CHEMICAL REACTION OCCURS TO FORM AN ORGANO-MODIFIED PRODUCT OF THE SILICEOUS SOLID, CHARACTERIZED BY HAVING A SURFACE LAYER OF DISCRETE ORGANIC GROUPS ATTACHED TO THE SILICEOUS SURFACE THROUGH PRIMARY CHEMICAL BONDS.
Claim 2
Dependent Claim
117 words
A PROCESS COMPRISING ACTIVATING AN INORGANIC, SUPERCOLLOIDAL SILICEOUS SOLID HAVING A SURFACE CONSISTING ESSENTIALLY OF SILICA CONTAINING SURFACE SILANOL GROUPS BUT SUBSTANTIALLY NO SURFACE BOUND ALUMINUM, BY HEATING IT TO A TEMPERATURE IN THE RANGE FROM 300 TO 700*C. UNTIL ITS SPECIFIC HYDROXYLATED SURFACE AREA IS REDUCED TO LESS THAN 85 PERCENT OF ITS SPECIFIC SURFACE AREA BUT NOT BELOW THE POINT WHERE THERE ARE ABOUT 2 SURFACE SILANOL GROUPS PER SQUARE MILLIMICRON OF SURFACE, AND THEREAFTER EFFECTING CONTACT BETWEEN IT AND A TERMINALLY-UNSATURATED HYDROCARBON, WHEREBY CHEMICAL REACTION OCCURS TO FORM AN ORGANO-MODIFIED PRODUCT OF THE SILICEOUS SOLID, CHARACTERIZED BY HAVING A SURFACE LAYER OF DISCRETE ORGANIC GROUPS ATTACHED TO THE SILICEOUS SURFACE THROUGH PRIMARY CHEMICAL BONDS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |