Patent US2731443A successfully refreshed from Google Patents.
US2731443A
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Vulcanized rubber stabilized with a mixture of a di(hydroxyphenyl) sulfide and a di(alkylhydroxyphenyl) methane
Assignee: Bridgestone Firestone Inc
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Filing: 1952-09-20
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Granted: 1956-01-17
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Expires: 1972-09-20
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Forman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:00
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/36; C08K5/37; C08K5/375; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A SULFUR-VULCANIZED RUBBER COMPOSITION WHICH INCLUDES AS AN INHIBITOR OF DETERIORATION A SMALL AMOUNT OF DI(HYDROXYPHENYL)SULFIDE AND A SMALL AMOUNT OF DI(HYDROXYPHENYL) METHANE; THE HYDROXYPHENYL GROUPS OF THE SULFIDE BEING OF THE CLASS WHICH CONSISTS OF UNSUBSTITUTED AND HYDROCARBON-SUBSTITUTED 2-HYDROXYPHENYL AND 4HYDROXYPHENYL GROUPS; AND THE DI(HYDROXYPHENYL)METHANE HAVING THE FORMULA
Claim 2
Dependent Claim
49 words
A SULFUR-VULCANIZED RUBBER COMPOSITION WHICH INCLUDES AS AN INHIBITOR OF DETERIORATION A SMALL AMOUNT OF DI(HYDROXYPHENYL)SULFIDE AND A SMALL AMOUNT OF DI(HYDROXYPHENYL) METHANE; THE HYDROXYPHENYL GROUPS OF THE SULFIDE BEING OF THE CLASS WHICH CONSISTS OF UNSUBSTITUTED AND HYDROCARBON-SUBSTITUTED 2-HYDROXYPHENYL AND 4HYDROXYPHENYL GROUPS; AND THE DI(HYDROXYPHENYL)METHANE HAVING THE FORMULA
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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |