Patent EP0006068A2 successfully refreshed from Google Patents.
US3567682A
Expired / Lapsed
US
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Antioxidants
Assignee: Ethyl Corp
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Filing: 1969-11-24
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Granted: 1971-03-02
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Expires: 1989-11-24
Abstract
Abstract REACTION OF HYDROGEN SULFIDE WITH THE HEMI-QUINONE OF A METHYLENE BISPHENOL RESULTS IN A TETRANUCLEAR PHENOL IN WHICH TWO MOLECULES OF THE METHYLENE BISPHENOL ARE BRIDGED AT THEIR METHYLENE GROUPS THROUGH A SULFUR ATOM. THESE ARE THIODIMETHYLIDYNE TETRAKISPHENOLS. THE COMPOUNDS ARE USEFUL AS ANTIOXIDANTS, EITHER ALONE OR IN COMBINATION WITH A DIALKYLTHIODIALKANOATE, A PHOSPHITE OR A PHOSPHONATE SYNERGIST.
Inventors
- 👤 Edward F Zaweski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:05
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/12; C09K15/14; C07; C07C; C07C323/00; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |