Patent US3617480A successfully refreshed from Google Patents.
US3617480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two stages of coking to make a high quality coke
Assignee: GREAT LAKES CARBON CORP
•
Filing: 1969-05-29
•
Granted: 1971-11-02
•
Expires: 1989-05-29
Abstract
Abstract The coking process disclosed herein provides a method for producing high quality petroleum coke which is particularly suitable for use in manufacturing electrothermic graphite electrodes. A high-boiling gas oil fraction is obtained from the overhead products produced during the coking of a petroleum oil residuum. This high-boiling gas oil fraction is segregated during the manufacture of regular or average quality petroleum coke and is subsequently coked in a separate coking operation under delayed coking conditions of time, temperature and pressure to produce a superior quality petroleum coke.
Inventors
- 👤 Harvey E Keel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:17
CPC Classifications
C; C10; C10B; C10B55/00; C10B57/00; C10B57/04; C10B57/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A method according to claim 1 wherein said petroleum residuum is derived from a topped or reduced asphaltenic or naphthenic crude oil.
Claim 2
Dependent Claim
21 words
A method according to claim 1 wherein said petroleum residuum is derived from a vacuum reduced asphaltenic or naphthenic crude oil.
References Cited (Backward Citations)
US2775549A
Cited
US2922755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |