US3766288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of alkenylbenzene
Assignee: Teijin Ltd
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Filing: 1972-03-27
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Granted: 1973-10-16
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Expires: 1992-03-27
Abstract
Abstract A PROCESS FOR PREPARING ALKENYLBENZENES, WHICH COMPRISES REACTING ALKYLBENZENES WITH 1,3-BUTADIENE AT AN ELEVATED TEMPERATURE IN THE PRESENCE OF AN ALKALI METAL CATALYST IN THE SUBSTANTIAL ABSENCE OF OXYGEN AND MOISTURE, WHEREIN SUCH CATALYST IS COMPOSED OF (1) 0.005 TO 0.4% BY WEIGHT, BASED ON THE ALKYLBENZENE, OF METALLIC POTASSIUM, AND (2) METALLIC SODIUM IN AN AMOUNT EXPRESSED BY THE FOLLOWING EQUATION (4.1X+2.0)$NA$(-0.073X+0.05) WHEREIN X REPRESENTS THE AMOUNT IN WEIGHT PERCENT OF THE METALLIC POTASSIUM.
Inventors
- 👤 I Omae
- 👤 T Shima
- 👤 T Urasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:40
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/02; B01J23/04; C; C07; C07C; C07C2/00; C07C2/54; C07C2/72; C07C2523/00; C07C2523/02; C07C2523/04
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |