Patent US4243513A successfully refreshed from Google Patents.
US4243513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing yield of petroleum pitch
Assignee: Witco Corp
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Filing: 1975-11-10
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Granted: 1981-01-06
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Expires: 1995-11-10
Abstract
Abstract Clarified slurry oil feedstock is heated at temperatures above 340° C. and preferably between 390° C. and 410° C. for periods exceeding a minimum of about 2 hours, under reflux conditions and in the absence of air, so as to maximize the polymerization of light ends in the formation of petroleum pitch. An increased yield of petroleum pitch is obtained from the clarified slurry oil feedstock.
Inventors
- 👤 Samuel I. Horowitz
- 👤 Henry T. Ingram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:43
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/002; C10G; C10G31/00; C10G31/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A process for making petroleum pitch from clarified slurry oil comprising refluxing the clarified slurry oil in the absence of air at temperatures from about 390° C. to about 410° C. for a period of from about 2 to about 10 hours whereby above 70% by weight of petroleum pitch based on the weight of clarified slurry oil is recovered, said pitch having a Mettler Softening Point in the range of about 70°-130° C.
Claim 2
Dependent Claim
74 words
A process for making petroleum pitch from clarified slurry oil comprising refluxing the clarified slurry oil in the absence of air at temperatures from about 390° C. to about 410° C. for a period of from about 2 to about 10 hours whereby above 70% by weight of petroleum pitch based on the weight of clarified slurry oil is recovered, said pitch having a Mettler Softening Point in the range of about 70°-130° C.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein the clarified slurry oil substantially boils at about 400° C. under atmospheric conditions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |