US4177133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing high-crystalline petroleum coke
Assignee: Maruzen Petrochemical Co Ltd
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Filing: 1978-07-14
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Granted: 1979-12-04
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Expires: 1998-07-14
Abstract
Abstract A high-crystalline petroleum coke is produced from low-sulfur petroleum feedstock such as virgin crude oil, distillation residuum and cracked residuum by subjecting the feedstock to preheat treatment under specific conditions to effect cracking and soaking thereof, subjecting the preheat-treated feedstock to flash distillation to remove non-crystalline substances contained therein as pitch and to recover distillate, fractionating the distillate to provide a heavy residue and subjecting the heavy residue to a delayed coking under specific conditions to produce the desired coke which has a coefficient of thermal expansion of less than 1.0x10-6/ DEG C. over 100 DEG -400 DEG C.
Inventors
- 👤 Yoshihiko Hase
- 👤 Kiyoshige Hayashi
- 👤 Nobuyuki Kobayashi
- 👤 Mikio Nakaniwa
- 👤 Minoru Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:28
CPC Classifications
C; C10; C10B; C10B55/00
Claims Analysis
Total Claims: 0
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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) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |