Patent US3247161A successfully refreshed from Google Patents.
US3247161A
Expired / Lapsed
US
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Stabilization of rubber with synergistic mixtures of p-phenylenediamines
Assignee: Universal Oil Products Co
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Filing: 1961-04-12
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Granted: 1966-04-19
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Expires: 1981-04-12
Abstract
No abstract record available.
Inventors
- 👤 William L Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:18
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
VULCANIZABLE DIENE HYDROCARBON RUBBER NORMALLY SUBJECT TO CRACKING DUE TO OZONE CONTAINING FROM ABOUT 0.5% TO ABOUT 5% BY WEIGHT OF A MIXTURE OF FROM ABOUT 50% TO ABOUT 90% BY WEIGHT OF AN N,N''-DE-SEC-ALKYLP-PHENYLENEDIAMINE IN WHICH EACH OF THE ALKYL GROUPS CONTAINS FROM 8 TO 12 CARBON ATOMS AND FROM ABOUT 50% TO ABOUT 10% BY WEIGHT OF N-PHENYL-N''-ALKYLPHENYL-PPHENYLENEDIAMINE IN WHICH THE ALKYL GROUP CONTAINS FROM 1 TO 12 CARBON ATOMS.
Claim 2
Dependent Claim
72 words
VULCANIZABLE DIENE HYDROCARBON RUBBER NORMALLY SUBJECT TO CRACKING DUE TO OZONE CONTAINING FROM ABOUT 0.5% TO ABOUT 5% BY WEIGHT OF A MIXTURE OF FROM ABOUT 50% TO ABOUT 90% BY WEIGHT OF AN N,N''-DE-SEC-ALKYLP-PHENYLENEDIAMINE IN WHICH EACH OF THE ALKYL GROUPS CONTAINS FROM 8 TO 12 CARBON ATOMS AND FROM ABOUT 50% TO ABOUT 10% BY WEIGHT OF N-PHENYL-N''-ALKYLPHENYL-PPHENYLENEDIAMINE IN WHICH THE ALKYL GROUP CONTAINS FROM 1 TO 12 CARBON ATOMS.
References Cited (Backward Citations)
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US2256189A
Cited
US2645674A
Cited
US3027315A
Cited
US2822395A
Cited
US2984646A
Cited
US3057819A
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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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |