US2657149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of esterifying the surface of a silica substrate having a reactive silanol surface and product thereof
Assignee: EIDP Inc
•
Filing: 1952-10-21
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Granted: 1953-10-27
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Expires: 1972-10-21
Abstract
No abstract record available.
Inventors
- 👤 Ralph K Iler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:29
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/025; B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0069; B01J20/00; B01J20/30; B01J20/32; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3248; C01; C01B; C01B33/00; C01B33/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
AN ESTERSIL, WHICH IS ORGANOHILIC, BEING PREFERENTIALLY WETTED BY BUTANOL IN A BUTANOLWATER MIXTURE, THE ESTERSIL COMPRISING A SUPERCOLLOIDAL SUBSTRATE COATED WITH OR GROUPS, THE SUBSTRATE HAVING A SURFACE ON SILICA AND HAVING A SPECIFIC SURFACE AREA OF FROM 1 TO 900 SQUARE METERS PER GRAM, THE COATING OF -OR GROUPS BEING CHEMICALLY BOUND TO SAID SILICA, R BEING A HYDROCARBON RADICAL OF FROM 2 TO 18 CARBON
Claim 2
Dependent Claim
68 words
AN ESTERSIL, WHICH IS ORGANOHILIC, BEING PREFERENTIALLY WETTED BY BUTANOL IN A BUTANOLWATER MIXTURE, THE ESTERSIL COMPRISING A SUPERCOLLOIDAL SUBSTRATE COATED WITH OR GROUPS, THE SUBSTRATE HAVING A SURFACE ON SILICA AND HAVING A SPECIFIC SURFACE AREA OF FROM 1 TO 900 SQUARE METERS PER GRAM, THE COATING OF -OR GROUPS BEING CHEMICALLY BOUND TO SAID SILICA, R BEING A HYDROCARBON RADICAL OF FROM 2 TO 18 CARBON
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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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |