Patent US3794579A successfully refreshed from Google Patents.
US3794579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating by-product oils produced in the production of olefins
Assignee: Kureha Corp
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Filing: 1972-12-29
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Granted: 1974-02-26
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Expires: 1992-12-29
Abstract
Abstract THERMALLY STABILIZED OIL FRACTIONS AND PITCH FRACTIONS ARE OBTAINED FROM BY-PRODUCT OILS IN THE PRODUCTION OF OLEFINS WHICH COMPRISES HEATING THE BY-PRODUCT OILS AT 400-600*C. FOR 10-1200 SECONDS UNDER A PRESSURE OF 20-2000 KG./CM2 TO FORM THERMALLY STABILIZED OIL FRACTIONS AND RESIDUE FRACTIONS AND THEN TREATING THE RESIDUE FRACTIONS AT 300-480*C., UNDER A PRESSURE OF FROM NORMAL PRESSURE TO 50 KG./CM.2 FOR 1-10 HOURS TO PROVIDE USEFUL PITCH FRACTIONS.
Inventors
- 👤 S Enomoto
- 👤 M Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:31
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/002; C10G; C10G31/00; C10G31/06
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |