US3647384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core for silicon carbide furnace
Assignee: Electro Minerals Canada Inc
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Filing: 1968-07-01
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Granted: 1972-03-07
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Expires: 1988-07-01
Abstract
Abstract Silicon carbide is produced commercially by the reaction of carbon and silica in a carbon core electrical resistance furnace. According to the present invention, an improved core for such a furnace comprises a nonconductive combustible tube packed with carbon.
Inventors
- 👤 Jean-Marie Dessureault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:55
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/60; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/97; C22; C22B; C22B5/00; C22B5/02; C22B5/04; C22B5/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
A process as set forth in claim 1 wherein said tube is constructed of a material selected from the group consisting of paper and plastic.
Claim 2
Dependent Claim
15 words
A process as set forth in claim 1 wherein said tube is constructed of paper.
Claim 3
Dependent Claim
17 words
A process as set forth in claim 1 wherein said tube is of substantially circular cross section.
Claim 4
Dependent Claim
25 words
A process as set forth in claim 4 wherein said tube is constructed of a material selected from the group consisting of paper and plastic.
Claim 5
Dependent Claim
15 words
A process as set forth in claim 4 wherein said tube is constructed of paper.
Claim 6
Dependent Claim
30 words
A process as set forth in claim 1 wherein said tube is a single tube of sufficient length to extend substantially from one end of the furnace to the other.
References Cited (Backward Citations)
US560291A
Cited
US2110733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |