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US2692871A
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US
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Compounded rubber stock
Assignee: Columbia Southern Chemical Corp
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Filing: 1950-06-29
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Granted: 1954-10-26
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Expires: 1970-06-29
Abstract
No abstract record available.
Inventors
- 👤 Pechukas Alphonse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD OF PREPARING A RUBBER COMPOSITION WHICH COMPRISES MIXING RUBBER, A PRECIPITATED SILICA PREPARED BY REACTION OF FINELY DIVIDED ALKALINE EARTH METAL SILICATE WITH AN ACID WHICH FORMS A WATER SOLUBLE ALKALINE EARTH METAL SALT, AND ADJUSTING THE PH OF THE MEDIUM TO 7 TO 8, AND 2 TO 15 PER CENT BY WEIGHT OF A WEIGHT OF A WATER MISCIBLE ALKYLENE POLYAMINE, BASED UPON THE WEIGHT OF THE SILICA, AND VULCANIZING THE MIXTURE.
Claim 2
Independent Claim
75 words
A METHOD OF PREPARING A RUBBER COMPOSITION WHICH COMPRISES MIXING RUBBER, A PRECIPITATED SILICA PREPARED BY REACTION OF FINELY DIVIDED ALKALINE EARTH METAL SILICATE WITH AN ACID WHICH FORMS A WATER SOLUBLE ALKALINE EARTH METAL SALT, AND ADJUSTING THE PH OF THE MEDIUM TO 7 TO 8, AND 2 TO 15 PER CENT BY WEIGHT OF A WEIGHT OF A WATER MISCIBLE ALKYLENE POLYAMINE, BASED UPON THE WEIGHT OF THE SILICA, AND VULCANIZING THE MIXTURE.
References Cited (Backward Citations)
US1418976A
Cited
GB368867A
Cited
US2047128A
Cited
US2103461A
Cited
US2114123A
Cited
US2315857A
Cited
US2455445A
Cited
US2578605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |