US3646232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycyclic dienes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-07-20
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Granted: 1972-02-29
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Expires: 1990-07-20
Abstract
Abstract WHERE N IS A WHOLE NUMBER OF AT LEAST ONE AND EACH OF R1, R2, R3 AND R4 IS EITHER A HYDROGEN ATOM OR A MONOVALENT HYDROCARBYL GROUP, PREFERABLY AN ALKYL GROUP, OR DERIVATIVES THEREOF IN WHCH ONE OR MORE OF THE CARBON ATOMS IN OR FORMING PART OF THE ENDOMETHYLENE BRIDGED RINGS AND NOT FORMING PART OF A CARBON-CARBON-DOUBLE BOND CARRIES A MONOVALENT HYDROCARBYL SUBSTITUENT GROUP AND A PROCESS FOR THE PREPARATION OF THE POLYCYCLIC DIENE BY DIELS-ALDER REACTION. YL)N< -(1-R2,2-R3,3-R4,6-R1-CYCLOHEX-1-EN-4,5-YLENE)- -(CYCLOPENT-1-EN-3,5-YLENE)- >(CYCLOPENTANE-1,2,3,5-TETRA A POLYSYCLIC DIENE HAVING THE STRUCTURE
Inventors
- 👤 Richard Gregory Foster
- 👤 Paul Hepworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
C; C07; C07C; C07C13/00; C07C13/28; C07C13/32; C07C13/62; C07C13/64; C07C1/00; C07C1/26; C07C1/30; C08; C08F; C08F210/00; C07C2603/00; C07C2603/56; C07C2603/90
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |