US2559932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber antioxidants
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1948-02-09
•
Granted: 1951-07-10
•
Expires: 1968-02-09
Abstract
No abstract record available.
Inventors
- 👤 Briggs Arthur Stanley
- 👤 Haworth James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:19
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A RUBBER AN ANTIOXIDANT COMPRISING A MIXTURE OF BIS-(2-HYDROXY-3:5-DIMETHYLPHENYL) ALKYLMETHANE IN WHICH THE ALKYL RADICAL HAS NOT MORE THAN 6 CARBON ATOMS AND THE CORRESPONDING BID(4-HYDROXY-2:5-DIMETHYLPHENYL) ALKYLMETHANE, SAID MIXTURE BEING OBTAINED BY CONDENSING IN THE PRESENCE OF AN ACID CONDENSING AGENT A MIXTURE OF 50-80% OF 2:4-DIMETHYLPHENOL AND 50-20% OF 2:5-DIMETHYLPHENOL WITH AN ALIPHATIC ALDEHYDE CONTAINING NOT MORE THAN 7 CARBON ATOMS.
Claim 2
Dependent Claim
62 words
A RUBBER AN ANTIOXIDANT COMPRISING A MIXTURE OF BIS-(2-HYDROXY-3:5-DIMETHYLPHENYL) ALKYLMETHANE IN WHICH THE ALKYL RADICAL HAS NOT MORE THAN 6 CARBON ATOMS AND THE CORRESPONDING BID(4-HYDROXY-2:5-DIMETHYLPHENYL) ALKYLMETHANE, SAID MIXTURE BEING OBTAINED BY CONDENSING IN THE PRESENCE OF AN ACID CONDENSING AGENT A MIXTURE OF 50-80% OF 2:4-DIMETHYLPHENOL AND 50-20% OF 2:5-DIMETHYLPHENOL WITH AN ALIPHATIC ALDEHYDE CONTAINING NOT MORE THAN 7 CARBON ATOMS.
Claim 3
Dependent Claim
67 words
A PROCESS FOR PRODUCING A RUBBER ANTIOXIDANT WHICH COMPRISES A MIXTURE OF BIS-(2HYDROXY-3:5-DIMETHYLPHENYL) ALKYLMETHANE IN WHICH THE ALKYL RADICAL HAS NOT MORE THAN 6 CARBON ATOMS AND THE CORRESPONDING BIS-(4-HYDROXY-2:5-DIMETHYLPHENYL) ALKYLMETHANE, SAID PROCESS COMPRISING THE STEPS OF CONDENSING IN THE PRESENCE OF AN ACID CONDENSING AGENT A MIXTURE COMPRISING 50-80% OF 2:4-DIMETHYLPHENOL AND 50-20% OF 2:5-DIMETHYLPHENOL WITH AN ALIPHATIC ALDEHYDE CONTAINING NOT MORE THAN 7 CARBON ATOMS.
Claim 4
Dependent Claim
67 words
A PROCESS FOR PRODUCING A RUBBER ANTIOXIDANT WHICH COMPRISES A MIXTURE OF BIS-(2HYDROXY-3:5-DIMETHYLPHENYL) ALKYLMETHANE IN WHICH THE ALKYL RADICAL HAS NOT MORE THAN 6 CARBON ATOMS AND THE CORRESPONDING BIS-(4-HYDROXY-2:5-DIMETHYLPHENYL) ALKYLMETHANE, SAID PROCESS COMPRISING THE STEPS OF CONDENSING IN THE PRESENCE OF AN ACID CONDENSING AGENT A MIXTURE COMPRISING 50-80% OF 2:4-DIMETHYLPHENOL AND 50-20% OF 2:5-DIMETHYLPHENOL WITH AN ALIPHATIC ALDEHYDE CONTAINING NOT MORE THAN 7 CARBON ATOMS.
References Cited (Backward Citations)
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US1989788A
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US2111769A
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US2285259A
Cited
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US2456582A
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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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |