Patent US3684665A successfully refreshed from Google Patents.
US3684665A
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US
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Process for recovering styrene and xylenes from cracked oil by extractive distillation with a dealkyl acetamide
Assignee: Toray Industries Inc
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Filing: 1970-02-11
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Granted: 1972-08-15
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Expires: 1990-02-11
Abstract
Abstract AROMATIC HYDROCARBONS AR RECOVERED FROM CRACKED OIL BY EXTRACTIVE-DISTILLATION. STYRENE, PARTICULARLY, IS DIRECTLY OBTAINED FROM THE CRACKED OIL BY EXTRACTIVE-DISTILLATION.
Inventors
- 👤 Hisao Abe
- 👤 Masanori Tatsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:15
CPC Classifications
C; C10; C10G; C10G7/00; C10G7/08; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |