Patent US3923531A successfully refreshed from Google Patents.
US3923531A
Expired / Lapsed
US
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Carbon composition and shaped article made therefrom
Assignee: Chicago Fire Brick Co
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Filing: 1974-07-05
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Granted: 1975-12-02
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Expires: 1994-07-05
Abstract
Abstract Particles of carbon mixed with silicon and a bonding amount of calcium aluminate or Portland type cement. Other refractory materials and pitch may also be present. The composition is mixed with water and poured into a mold to form various shaped articles. These are set and dried sufficiently for shipment and use. The final carbon bonding takes place at high temperature use, above 2500*F, aided by carbonization of the pitch if pitch is also present.
Inventors
- 👤 Joseph R Parsons
- 👤 Harold L Rechter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:24
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B35/00; C04B35/515; C04B35/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A COMPOSITION SUITABLE FOR MAKING SHAPED REFRACTORY ARTICLES CONSISTING ESSENTIALLY OF PARTICLES OF CARBON IN FROM 20-80 PER CENT BY WEIGHT, A HYDRAULIC CEMENT IN FROM 5-30 PER CENT BY WEIGHT, PARTICLES OF A REFRACTORY OXIDE OR SILICATE IN 0-65 PER CENT BY WEIGHT, SILICON METAL IN AT LEAST 5 PER CENT BY WEIGHT, AND PITCH FROM 0-20 PER CENT BY WEIGHT.
Claim 2
Dependent Claim
62 words
A COMPOSITION SUITABLE FOR MAKING SHAPED REFRACTORY ARTICLES CONSISTING ESSENTIALLY OF PARTICLES OF CARBON IN FROM 20-80 PER CENT BY WEIGHT, A HYDRAULIC CEMENT IN FROM 5-30 PER CENT BY WEIGHT, PARTICLES OF A REFRACTORY OXIDE OR SILICATE IN 0-65 PER CENT BY WEIGHT, SILICON METAL IN AT LEAST 5 PER CENT BY WEIGHT, AND PITCH FROM 0-20 PER CENT BY WEIGHT.
Claim 3
Dependent Claim
16 words
The composition of claim 1 in which silicon is present in 5-25 per cent by weight.
Claim 4
Dependent Claim
32 words
The composition of claim 1 in which silicon is present in at least 10 per cent by weight and calcium aluminate cement is present in at least 10 per cent by weight.
Claim 5
Dependent Claim
25 words
The composition of claim 1 in which aluminum oxide, silica, zircon, pulverized firebrick, clay, or mixtures thereof are present in 20-50 per cent by weight.
Claim 6
Dependent Claim
20 words
The composition of claim 1 in which pitch is present and the aluminum oxide is present as refractory calcined bauxite.
Claim 7
Dependent Claim
43 words
A refractory shaped article consisting essentially of a carbon concrete consisting essentially of from 20-80 per cent by weight of carbon particles and from 5-25 per cent by weight of particles of silicon bonded together by a calcium aluminate or calcium silicate cement.
Claim 8
Dependent Claim
43 words
A refractory shaped article consisting essentially of a carbon concrete consisting essentially of from 20-80 per cent by weight of carbon particles and from 5-25 per cent by weight of particles of silicon bonded together by a calcium aluminate or calcium silicate cement.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |