US4165220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing hardened semicoke briquettes
Assignee: Centro Sperimentale Metallurgico SpA
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Filing: 1978-05-22
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Granted: 1979-08-21
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Expires: 1998-05-22
Abstract
Abstract Briquettes obtained from semicoke and a binder such as pitch, can be hardened when stacked to relatively great height of 5 to 10 meters, provided the "green" briquettes are heated in a vertical oven at a temperature between 300 DEG C. and 400 DEG C. for 35 to 50 minutes in an inert atmosphere such as nitrogen.
Inventors
- 👤 Angelo Colletta
- 👤 Paolo Marini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:42
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/02; C10L5/26; C10L5/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
Process for producing hardened semicoke briquettes, comprising forming "green" briquettes by admixing semicoke that has been carbonized at a temperature between about 900° and 1000° C. for 5 to 45 minutes, with pitch as a binder, passing the admixed semicoke and pitch through a rolling operation in which the admixed semicoke and pitch is subjected to a pressure between 2 and 6 tons per centimeter width of the admixed material, and heating the "green" briquettes in a vertical oven at a bed depth of about 5 to 10 meters at a temperature between 300° C. and 400° C. and for a time interval between 35 and 50 minutes.
Claim 2
Dependent Claim
108 words
Process for producing hardened semicoke briquettes, comprising forming "green" briquettes by admixing semicoke that has been carbonized at a temperature between about 900° and 1000° C. for 5 to 45 minutes, with pitch as a binder, passing the admixed semicoke and pitch through a rolling operation in which the admixed semicoke and pitch is subjected to a pressure between 2 and 6 tons per centimeter width of the admixed material, and heating the "green" briquettes in a vertical oven at a bed depth of about 5 to 10 meters at a temperature between 300° C. and 400° C. and for a time interval between 35 and 50 minutes.
Claim 3
Dependent Claim
18 words
Process as claimed in claim 1, in which said heating is carried out in a substantially inert atmosphere.
Claim 4
Dependent Claim
13 words
Process as claimed in claim 2, in which said inert atmosphere is nitrogen.
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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |