Patent US4646146A successfully refreshed from Google Patents.
Patent US4307052A successfully refreshed from Google Patents.
US4307052A
Expired / Lapsed
US
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Process for carbon electrode manufacture
Assignee: Ashland LLC
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Filing: 1980-08-15
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Granted: 1981-12-22
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Expires: 2000-08-15
Abstract
Abstract Disclosed is a carbon extrusion oil for preparing carbon and graphite electrodes. The composition comprises a mixture of straight-chain paraffin hydrocarbons and cylinder stock derived from a naphthenic type of crude oil. This invention relates to a method for producing extruded carbon or graphite bodies and to a composition for use therein.
Inventors
- 👤 Charles R. Gannon
- 👤 William R. Sawran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:13
CPC Classifications
C; C10; C10M; C10M101/00; C10M101/02; B; B30; B30B; B30B15/00; B30B15/0005; B30B15/0011; C10M101/025; C10M2203/00; C10M2203/10; C10M2203/1006; C10M2203/102; C10M2203/1025; C10M2203/104; C10M2203/1045; C10M2203/106; C10M2203/1065; C10M2203/108; C10M2203/1085; C10M2205/00; C10M2205/14; C10M2205/143; C10M2205/16; C10M2205/163; C10M2205/17; C10M2205/173; C10M2205/18; C10M2205/183; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
A process for extruding green carbon electrodes comprising forcing a mixture of a carbonaceous material and a binder selected from the group consisting of coal-tar pitch, petroleum pitch and synthetic resins, through an extrusion die while applying to the area of contact between said mixture of carbonaceous material and binder and said extrusion die an extrusion oil comprising between about 45 and about 75 parts by weight per 100 parts of a mixture of straight-chain paraffinic hydrocarbons having an average number of carbon atoms per molecule between about 16 and about 45 and a cylinder stock derived from crude petroleum.
Claim 2
Dependent Claim
100 words
A process for extruding green carbon electrodes comprising forcing a mixture of a carbonaceous material and a binder selected from the group consisting of coal-tar pitch, petroleum pitch and synthetic resins, through an extrusion die while applying to the area of contact between said mixture of carbonaceous material and binder and said extrusion die an extrusion oil comprising between about 45 and about 75 parts by weight per 100 parts of a mixture of straight-chain paraffinic hydrocarbons having an average number of carbon atoms per molecule between about 16 and about 45 and a cylinder stock derived from crude petroleum.
Claim 3
Dependent Claim
141 words
The process of claim 1 wherein said extrusion oil comprises between about 45 and about 75 parts by weight per 100 parts of a mixture of straight-chain paraffinic hydrocarbons having an average number of carbon atoms per molecule of between about 16 and 45 and a cylinder stock derived from crude petroleum, wherein said straight-chain paraffinic hydrocarbons are derived by: (a) distilling light vacuum gas oil under a reduced pressure of between about 20 mm and about 100 mm of mercury absolute at a temperature of between about 260° C. and about 538° C.; (b) extracting the distillate obtained from step (a) with a solvent having an affinity for hydrocarbons, thereby obtaining an extract product and a raffinate product; and (c) solvent de-waxing the raffinate product of step (b) thereby obtaining a straight-chain paraffin fraction and a branched chain paraffin fraction.
Claim 4
Dependent Claim
24 words
The process of claim 2 wherein said cylinder stock is derived by distilling atmospherically topped crude petroleum at a pressure less than atmospheric pressure.
Claim 5
Dependent Claim
26 words
The process of claim 2 wherein said cylinder stock has an average number of carbon atoms per hydrocarbon molecule of between about 40 and about 70.
References Cited (Backward Citations)
US2764529A
Cited
US2852445A
Cited
US3003937A
Cited
US2900322A
Cited
US3284372A
Cited
US4188279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |