US2914503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanized rubber-silica compositions
Assignee: Columbia Southern Chemical Corp
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Filing: 1957-08-30
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Granted: 1959-11-24
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Expires: 1977-08-30
Abstract
No abstract record available.
Inventors
- 👤 Pechukas Alphonse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:28
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A COMPOSITION WHICH COMPRISES A RUBBER OF THE GROUP CONSISTING OF NATURAL RUBBER AND SYNTHETIC RUBBERY POLYMERS OF CONJUGATED DIENES AND COPOLYMERS OF CONJUGATED DIENES WITH ETHYLENICALLY UNSATURATED MONOMERS AND FINELY DIVIDED, PRECIPITATED, HYDRATED, AMORPHOUS SILICA HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF 0.015 TO 0.05 MICRON AND CONTAINING SIO2 AND BOUND WATER IN THE PROPORTION CORRESPONDING TO THE FORMULA H2O.(SIO2)I, WHERE X IS A NUMBER BETWEEN 12 AND 85, SAID SILICA HAVING A SURFACE AREA OF 50 TO 200 SQUARE METERS PER GRAM AND THE CRYSTALLINE SILICA CONTENT THEREOF BEING LESS THAN 5 PERCENT BY WEIGHT, THE TOTAL SIO2 CONTENT THEREOF BEING IN EXCESS OF 80 PERCENT BY WEIGHT.
Claim 2
Dependent Claim
110 words
A COMPOSITION WHICH COMPRISES A RUBBER OF THE GROUP CONSISTING OF NATURAL RUBBER AND SYNTHETIC RUBBERY POLYMERS OF CONJUGATED DIENES AND COPOLYMERS OF CONJUGATED DIENES WITH ETHYLENICALLY UNSATURATED MONOMERS AND FINELY DIVIDED, PRECIPITATED, HYDRATED, AMORPHOUS SILICA HAVING AN AVERAGE ULTIMATE PARTICLE SIZE OF 0.015 TO 0.05 MICRON AND CONTAINING SIO2 AND BOUND WATER IN THE PROPORTION CORRESPONDING TO THE FORMULA H2O.(SIO2)I, WHERE X IS A NUMBER BETWEEN 12 AND 85, SAID SILICA HAVING A SURFACE AREA OF 50 TO 200 SQUARE METERS PER GRAM AND THE CRYSTALLINE SILICA CONTENT THEREOF BEING LESS THAN 5 PERCENT BY WEIGHT, THE TOTAL SIO2 CONTENT THEREOF BEING IN EXCESS OF 80 PERCENT BY WEIGHT.
References Cited (Backward Citations)
US2806012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |