Patent US2790839A successfully refreshed from Google Patents.
US2790839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low hysteresis rubber treatment
Assignee: Uniroyal Inc
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Filing: 1953-11-16
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Granted: 1957-04-30
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Expires: 1973-11-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Doak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:33
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/39
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS WHICH COMPRISES MIXING A RUBBER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, RUBBERY HOMOPOLYMERS OF ALIPHATIC CONJUGATED DIOLEFINS AND RUBBERY COPOLYMERS OF ALIPHATIC CONJUGATED DIOLEFINS AND COPOLYMERIZABLE MONOOLEFINIC COMPOUNDS, WHICH COPOLYMENS CONTAIN AT LEAST 50% OF COMBINED DIOLEFIN, WITH A RELATIVELY LARGE AMOUNT OF RUBBER-REINFORCING CARBON BLACK AND WITH FROM 1 TO 3 PARTS BY WEIGHT, PER 100 PARTS OF SAID RUBBER, OF PIPERIDINIUM PENTAMETHYLENE DITHIOCARBAMATE, HEATING THE MIXTURE IN THE ABSENCE OF SULFUR AND SULFUR-YIELDING COMPOUNDS AT A TEMPERATURE RANGING FROM 275*F. TO A POINT JUST SHORT OF THAT AT WHICH THE RUBBER WILL BE INJURED, THEREAFTER INCORPORATING VULCANIZING AND OTHER DESIRED INGREDIENTS, SHAPING THE RESULTING MASS, AND VULCANIZING THE SHAPED MASS.
Claim 2
Dependent Claim
116 words
A PROCESS WHICH COMPRISES MIXING A RUBBER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, RUBBERY HOMOPOLYMERS OF ALIPHATIC CONJUGATED DIOLEFINS AND RUBBERY COPOLYMERS OF ALIPHATIC CONJUGATED DIOLEFINS AND COPOLYMERIZABLE MONOOLEFINIC COMPOUNDS, WHICH COPOLYMENS CONTAIN AT LEAST 50% OF COMBINED DIOLEFIN, WITH A RELATIVELY LARGE AMOUNT OF RUBBER-REINFORCING CARBON BLACK AND WITH FROM 1 TO 3 PARTS BY WEIGHT, PER 100 PARTS OF SAID RUBBER, OF PIPERIDINIUM PENTAMETHYLENE DITHIOCARBAMATE, HEATING THE MIXTURE IN THE ABSENCE OF SULFUR AND SULFUR-YIELDING COMPOUNDS AT A TEMPERATURE RANGING FROM 275*F. TO A POINT JUST SHORT OF THAT AT WHICH THE RUBBER WILL BE INJURED, THEREAFTER INCORPORATING VULCANIZING AND OTHER DESIRED INGREDIENTS, SHAPING THE RESULTING MASS, AND VULCANIZING THE SHAPED MASS.
References Cited (Backward Citations)
US2058246A
Cited
US2118601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |