US3767564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of low pour fuel oils
Assignee: Texaco Inc
•
Filing: 1971-06-25
•
Granted: 1973-10-23
•
Expires: 1991-06-25
Abstract
Abstract Low pour fuel oils are obtained by first converting waxy pour residua into the corresponding viscous pour residua by deep vacuum fractionation, with or without auxiliary visbreaking or thermal or catalytic cracking, and then blending with sufficient low pour cutter stock to produce fuel oils having commercially acceptable viscosities and pour points.
Inventors
- 👤 J Colvert
- 👤 D Youngblood
- 👤 T Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:20
CPC Classifications
C; C10; C10G; C10G9/00; C10G11/00; C10G11/14; C10G11/18; C10G7/00; C10L; C10L1/00; C10L1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
37 words
A method according to claim 1 in which at least a portion of the distillate from the vacuum distillation is thermally cracked and the thermally cracked product so obtained is combined with the product of the visbreaking.
Claim 2
Dependent Claim
50 words
A method according to claim 1 in which the viscous pour residuum is produced by vacuum distillation of a waxy crude feedstock at a temperature sufficiently high to produce a viscous pour residuum and the low pour cutter is produced by cracking an overhead fraction from the said vacuum distillation.
Claim 3
Dependent Claim
14 words
The method according to claim 2 in which the cracking is fluidized catalytic cracking.
Claim 4
Dependent Claim
16 words
A method according to claim 1 in which the cutter is a 350*-550*F. gas oil fraction.
References Cited (Backward Citations)
US2663675A
Cited
US2762754A
Cited
US2900327A
Cited
US3254020A
Cited
US3303128A
Cited
US3575843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |