Patent US3684685A successfully refreshed from Google Patents.
US3684685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the gel strength and flow properties of crude oil
Assignee: Texaco Inc
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Filing: 1970-05-25
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Granted: 1972-08-15
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Expires: 1990-05-25
Abstract
Abstract THE PIPELINE FLOW CHARACTERISTIC AND THE GEL STRENGTH OF WAXY CRUDES, IN PARTICULAR NORTH AFRICAN CRUDES, ARE IMPROVED BY CENTRIFUGING UNDER SPECIFIC CONDITION TO REMOVE AN OPTIMUM AMOUNT OF WAX. IN A MODIFICATION OF THE PROCESS, LESS THAN THE OPTIMUM OF WAX IS REMOVED AND A DEWAXING AID IS ADDED TO THE CRUDE PRIOR TO CENTRIFUGING OR TO THE DEWAXED CRUDE. THE REMOVED WAX CAN BE VISBROKEN OR THEMALLY CRACKED, AND THE RESULTING FLUID CAN BE ADDED TO THE DEWAXED OIL.
Inventors
- 👤 Sheldon Herbstman
- 👤 Reese A Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:31
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; C; C10; C10G; C10G73/00; C10G73/02; C10G73/04
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 |