US4209295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace with homogeneous refractory tubular liner
Assignee: III ACQUIRING Inc CITY OF INDUSTRY CA A CORP OF
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Filing: 1978-06-26
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Granted: 1980-06-24
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Expires: 1998-06-26
Abstract
Abstract A high temperature furnace having an access opening and a thick-walled heat resistant lining comprising at least one homogeneous tubular member of multiple generally-tubular layers of vacuum deposited refractory fibers. Larger furnaces utilize two or more liner tubes in end-to-end abutment. The abutting ends may be rabbeted and internested to assure a heat barrier.
Inventors
- 👤 Carl E. Frahme
- 👤 Gary E. Wygant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:41
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; F27D; F27D1/00; F27D1/0003; F27D1/0006; F27D1/0009; F27B2014/0843
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
That improvement in a high-temperature furnace having a tubular housing closed at one end and having an access closure at its other end, said improvement comprising a refractory lining for said housing comprising at least one homogeneous rigid tubular member formed of multiple generally annular layers of inter-bonded refractory fibers vacuum deposited from an aqueous suspension thereof to a wall thickness of at least three inches and having a density of the order of 10-12 pounds per cubic foot.
Claim 2
Dependent Claim
79 words
That improvement in a high-temperature furnace having a tubular housing closed at one end and having an access closure at its other end, said improvement comprising a refractory lining for said housing comprising at least one homogeneous rigid tubular member formed of multiple generally annular layers of inter-bonded refractory fibers vacuum deposited from an aqueous suspension thereof to a wall thickness of at least three inches and having a density of the order of 10-12 pounds per cubic foot.
Claim 3
Dependent Claim
41 words
That improvement in a furnace defined in claim 1 characterized in that said refractory lining includes a plurality of said tubular members in end-to-end abutting contact, and said abutting adjacent ends of which are rabbeted to internest snugly with one another.
Claim 4
Dependent Claim
29 words
That improvement defined in claim 1 characterized in that said access closure is provided on the inner side thereof with a one-piece refractory liner of vacuum deposited refractory fibers.
Claim 5
Dependent Claim
60 words
That improvement in a furnace defined in claim 1 characterized in that tubular housing is supported in an upright position with said access closure uppermost, a rigid support at the bottom of said housing for material to be heated, and the major portion of the interior of said housing being covered by a refractory lining of said inter-bonded refractory fibers.
Claim 6
Dependent Claim
32 words
That improvement in a furnace defined in claim 1 characterized in that said refractory lining is retained in assembled position within said housing without retaining means interconnecting said lining and said housing.
Claim 7
Dependent Claim
20 words
That improvement in a furnace defined in claim 1 characterized in that said refractory fibers are spun ceramic refractory fibers.
Claim 8
Dependent Claim
26 words
That improvement in a furnace defined in claim 6 characterized in that, in general, said refractory fibers have a length ranging between three and six inches.
Claim 9
Dependent Claim
24 words
That improvement in a furnace defined in claim 6 characterized in that said refractory lining has a radial thickness of at least five inches.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |