US2764572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compounded rubber stock
Assignee: Columbia Southern Chemical Corp
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Filing: 1952-11-04
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Granted: 1956-09-25
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Expires: 1972-11-04
Abstract
No abstract record available.
Inventors
- 👤 Pechukas Alphonse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:26
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A METHOD OF PREPARING A RUBBER COMPOSITION CONTAINING SILICA, THE IMPROVEMENT WHICH COMPRISES MILLING FINELY DIVIDED, HYDRATED, AMORPHOUS SILICA CHARACTERIZED BY THE PRESENCE OF FLOCS AND HAVING AN AVERAGE ULTIMATE PARICLE SIZE IN THE RANGE OF 0.015 TO 0.04 MICRON AND A SURFACE AREA OF 50 TO 200 SQUARE METERS PER GRAM INTO RUBBER WHICH IS ESSENTIALLY FREE FROM POLAR COMPOUNDS INCLUDING VULCANIZING INGREDIENTS; AND, AFTER SAID SILICA IS THOROUGHLY DISTRIBUTED THROUGHOUT SAID RUBBER, THEREAFTER MILLING VULCANIZING INGREDIENTS INTO THE RUBBER, AND VULCANIZING THE PRODUCT.
Claim 2
Dependent Claim
86 words
IN A METHOD OF PREPARING A RUBBER COMPOSITION CONTAINING SILICA, THE IMPROVEMENT WHICH COMPRISES MILLING FINELY DIVIDED, HYDRATED, AMORPHOUS SILICA CHARACTERIZED BY THE PRESENCE OF FLOCS AND HAVING AN AVERAGE ULTIMATE PARICLE SIZE IN THE RANGE OF 0.015 TO 0.04 MICRON AND A SURFACE AREA OF 50 TO 200 SQUARE METERS PER GRAM INTO RUBBER WHICH IS ESSENTIALLY FREE FROM POLAR COMPOUNDS INCLUDING VULCANIZING INGREDIENTS; AND, AFTER SAID SILICA IS THOROUGHLY DISTRIBUTED THROUGHOUT SAID RUBBER, THEREAFTER MILLING VULCANIZING INGREDIENTS INTO THE RUBBER, AND VULCANIZING THE PRODUCT.
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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |