US3889608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the preparation of siliceous ashes
Assignee: Structural Metals Inc
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Filing: 1974-03-18
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Granted: 1975-06-17
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Expires: 1994-03-18
Abstract
Abstract A process and apparatus for the incineration of organic material, and particularly agricultural waste products, to produce useable energy, consists of exposing the material to elevated temperature in an excess of air in a cylindrical furnace which terminates at the top in a frustum of a cone, the furnace having tangential inlet means at the bottom and discharge means comprising a concentric hollow cylinder projecting into the bottom portion of the furnace; the process and apparatus are particularly useful in the preparation of siliceous compositions from materials such as rice hulls and the process can be conducted under conditions whereby a highly reactive amorphous form of silica is produced, which silica is useful as a component of hydraulic cements.
Inventors
- 👤 Norman Pitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:35
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/32; F23G7/00; F23G7/10; F23J; F23J15/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
A furnace comprising: a. a circular base; b. cylindrical side walls projecting upwardly from said base; c. a top portion covering said side walls; d. a peripheral tangential material inlet to said furnace at the bottom portion thereof for admitting material to be burned, and; e. outlet means in said base for discharging burned material, said outlet means comprising a hollow cylinder projecting concentrically into said furnace above said base.
Claim 2
Dependent Claim
70 words
A furnace comprising: a. a circular base; b. cylindrical side walls projecting upwardly from said base; c. a top portion covering said side walls; d. a peripheral tangential material inlet to said furnace at the bottom portion thereof for admitting material to be burned, and; e. outlet means in said base for discharging burned material, said outlet means comprising a hollow cylinder projecting concentrically into said furnace above said base.
Claim 3
Dependent Claim
15 words
The furnace of claim 1 wherein said top portion comprises a frustum of a cone.
Claim 4
Dependent Claim
24 words
The furnace of claim 1 wherein said circular base has a spiral ramp at the top thereof within said furnace surrounding said outlet means.
Claim 5
Dependent Claim
130 words
Combustion apparatus comprising: a. a circular base; b. cylindrical side walls projecting upwardly from said base; c. a top portion covering said side walls; d. a peripheral tangential material inlet to said furnace at the bottom portion thereof for admitting material to be burned, e. outlet means in said base for discharging burned material, said outlet means comprising a hollow cylinder projecting concentrically into said furnace above said base. f. Means for admitting combustible gas to said furnace; g. means for admitting solid material to be burned in said furnace in a stream of combustion supporting gases; h. means for conducting combustion products from said furnace; i. means for separating solid and gaseous combustion products; j. means for recirculating solid combustion products, and; k. means for discharging solid combustion products.
Claim 6
Dependent Claim
130 words
Combustion apparatus comprising: a. a circular base; b. cylindrical side walls projecting upwardly from said base; c. a top portion covering said side walls; d. a peripheral tangential material inlet to said furnace at the bottom portion thereof for admitting material to be burned, e. outlet means in said base for discharging burned material, said outlet means comprising a hollow cylinder projecting concentrically into said furnace above said base. f. Means for admitting combustible gas to said furnace; g. means for admitting solid material to be burned in said furnace in a stream of combustion supporting gases; h. means for conducting combustion products from said furnace; i. means for separating solid and gaseous combustion products; j. means for recirculating solid combustion products, and; k. means for discharging solid combustion products.
Claim 7
Dependent Claim
36 words
The combustion apparatus of claim 4 further characterized in that said circular base has a spiral ramp at the top thereof within said furnace surrounding said outlet means such that said tangential material inlet cooperates therewith.
Claim 8
Dependent Claim
79 words
A furnace comprising: a. a circular base; b. cylindrical side walls projecting upwardly from said base; c. a top portion covering said side walls; d. a peripheral tangential material inlet to said furnace at the bottom portion thereof for admitting material to be burned, e. outlet means in said base for discharging combustion products; f. and a spiral ramp within said furnace surrounding said outlet means such that said material inlet is near the bottom of said spiral ramp.
Claim 9
Dependent Claim
79 words
A furnace comprising: a. a circular base; b. cylindrical side walls projecting upwardly from said base; c. a top portion covering said side walls; d. a peripheral tangential material inlet to said furnace at the bottom portion thereof for admitting material to be burned, e. outlet means in said base for discharging combustion products; f. and a spiral ramp within said furnace surrounding said outlet means such that said material inlet is near the bottom of said spiral ramp.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |