Patent US3565856A successfully refreshed from Google Patents.
US3565856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
P-phenylenediamine antiozonants
Assignee: Monsanto Chemicals Ltd
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Filing: 1967-10-30
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Granted: 1971-02-23
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Expires: 1987-10-30
Abstract
Abstract DERIVATIVES OF P-PHENYLENEDIAMINE HAVING THE FORMULA 1-(R-NH-),R2,4-(R1-NH-),R3-BENZENE WHERE R IS SECONDARY ALKYL OR CYCLOALKYL OF UP TO EIGHT CARBON ATOMS. R1 IS SECONDARY ALKYL, CYCLOALKYL, OR ARYL OF UP TO EIGHT CARBON ATOMS, AND EACH R2 AND R3 IS ALKYL OF UP TO FIVE CARBON ATOMS PROVIDED THAT THE TOTAL NUMBER OF CARBON ATOMS IN R, R1, R2, AND R3 IS NOT GREATER THAN 20 ARE USEFUL IN RUBBER AS ANTIOZONANTS AND RESIST DISCOLORATION AND STAINING.
Inventors
- 👤 Keith Martyn Davies
- 👤 Alan Jeffrey Neale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:06
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18; Y; Y10; Y10S; Y10S524/00; Y10S524/918
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |