Patent CA651668A successfully refreshed from Google Patents.
US3732071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tower furnace
Assignee: Dow Chemical Co
•
Filing: 1971-12-17
•
Granted: 1973-05-08
•
Expires: 1991-12-17
Abstract
Abstract Disclosed herein is an improved apparatus and process for the manufacture of foamed ceramic material. The process comprises passing particles of a bloatable composition downwardly in a continuous planar curtain through an elongated heating zone, thereby to heat the particles above their melting temperature, and either cooling the particles to form expanded aggregate or alternatively collecting the particles while they are still molten to form a slab of foamed ceramic material. The improved apparatus comprises a tower furnace having an elongated serrated drum feeder positioned to discharge particles into the furnace in the form of a uniform curtain. The improved process and apparatus are especially advantageous to ceramic foam manufacture in that, as collected, the particles form a foamed ceramic slab of relatively uniform density and cell structure and of a generally rectangular cross-section.
Inventors
- 👤 N Waldman
- 👤 J Meserve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/066; C04B38/00; C04B38/0038; F; F27; F27B; F27B1/00; F27B1/005; Y; Y02; Y02P; Y02P40/00; Y02P40/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
200 words
In a tower furnace defining an elongated vertical furnace chamber, a supply hopper for particulate material mounted above the furnace chamber, and a particle feeding device positioned between the hopper and the furnace chamber, the improved feeding device comprising: a casing defining a pre-heating chamber; an elongated generally horizontally-disposed serrated drum feeder mounted rotatably within said chamber, said drum adapted to receive particles from the hopper onto the drum surface where they lodge in the serrations of the drum to be dislodged in the form of a generally planar curtain of particles as the drum rotates; said casing fitted with a particle entry port and a particle exit port, said entry port positioned above the drum in communication with the particle supply hopper, said exit port positioned beneath the drum in the path of the curtain of particles emanating therefrom; and a guide chute positioned below the exit port and immediately adjacent thereto, said guide chute being fitted with a plurality of spaced-apart baffles disposed at generally right angles to the planar curtain of particles passing through the chute and said chute adapted to engage and direct the curtain of particles passing from the pre-heat chamber through the furnace chamber.
Claim 2
Dependent Claim
200 words
In a tower furnace defining an elongated vertical furnace chamber, a supply hopper for particulate material mounted above the furnace chamber, and a particle feeding device positioned between the hopper and the furnace chamber, the improved feeding device comprising: a casing defining a pre-heating chamber; an elongated generally horizontally-disposed serrated drum feeder mounted rotatably within said chamber, said drum adapted to receive particles from the hopper onto the drum surface where they lodge in the serrations of the drum to be dislodged in the form of a generally planar curtain of particles as the drum rotates; said casing fitted with a particle entry port and a particle exit port, said entry port positioned above the drum in communication with the particle supply hopper, said exit port positioned beneath the drum in the path of the curtain of particles emanating therefrom; and a guide chute positioned below the exit port and immediately adjacent thereto, said guide chute being fitted with a plurality of spaced-apart baffles disposed at generally right angles to the planar curtain of particles passing through the chute and said chute adapted to engage and direct the curtain of particles passing from the pre-heat chamber through the furnace chamber.
Claim 3
Dependent Claim
37 words
An improved furnace as in claim 1 wherein the drum feeder is rotatably mounted upon a hollow shaft defining a conduit adapted to transport a supply of cooling fluids into heat exchange relationship with the drum feeder.
Claim 4
Dependent Claim
53 words
An apparatus as in claim 1 wherein the distance between the baffles is from about 10 to about 25 times the average major dimension of the individual particles, and the length of channels formed by the baffles is from about 150 to about 250 times the average major dimension of the individual particles.
Claim 5
Dependent Claim
12 words
An apparatus as in claim 1 wherein the chute is pivotally mounted.
Claim 6
Dependent Claim
243 words
In a tower furnace defining an elongated vertical furnace chamber, a supply hopper for particulate material mounted above the furnace chamber, and a particle feeding device positioned between the hopper and the furnace chamber, the improved feeding device comprising: a casing defining a pre-heating chamber; an elongated generally horizontally-disposed serrated drum feeder mounted rotatably within said chamber, said drum adapted to receive particles from the hopper onto the drum surface where they lodge in the serrations of the drum to be dislodged in the form of a generally planar curtain of particles as the drum rotates; said casing fitted with a particle entry port and a particle exit port, said entry port positioned above the drum in communication with the particle supply hopper, said exit port positioned beneath the drum in the path of the curtain of particles emanating therefrom; a guide chute positioned below the exit port and immediately adjacent thereto, said chute adapted to engage and direct the curtain of particles passing from the pre-heat chamber through the furnace chamber and downwardly subtending particle deflector means mounted in the lower portion of the furnace chamber remote from the curtain of particles, said deflector means having a planar particle-deflecting surface terminating in a lower edge forming an acute angle with the curtain of particles, and originating in an upper edge positioned adjacent to the wall of the furnace chamber, said deflector means fitted with conduits for conveying cooling fluids through the deflector.
Claim 7
Dependent Claim
243 words
In a tower furnace defining an elongated vertical furnace chamber, a supply hopper for particulate material mounted above the furnace chamber, and a particle feeding device positioned between the hopper and the furnace chamber, the improved feeding device comprising: a casing defining a pre-heating chamber; an elongated generally horizontally-disposed serrated drum feeder mounted rotatably within said chamber, said drum adapted to receive particles from the hopper onto the drum surface where they lodge in the serrations of the drum to be dislodged in the form of a generally planar curtain of particles as the drum rotates; said casing fitted with a particle entry port and a particle exit port, said entry port positioned above the drum in communication with the particle supply hopper, said exit port positioned beneath the drum in the path of the curtain of particles emanating therefrom; a guide chute positioned below the exit port and immediately adjacent thereto, said chute adapted to engage and direct the curtain of particles passing from the pre-heat chamber through the furnace chamber and downwardly subtending particle deflector means mounted in the lower portion of the furnace chamber remote from the curtain of particles, said deflector means having a planar particle-deflecting surface terminating in a lower edge forming an acute angle with the curtain of particles, and originating in an upper edge positioned adjacent to the wall of the furnace chamber, said deflector means fitted with conduits for conveying cooling fluids through the deflector.
Claim 8
Dependent Claim
33 words
An apparatus as in claim 5 wherein the guide chute is fitted with a plurality of spaced-apart baffles disposed at generally right angles to the planar curtain of particles passing through the chute.
References Cited (Backward Citations)
US1153561A
Cited
US3056184A
Cited
US3151965A
Cited
US3115335A
Cited
US3418403A
Cited
US3601380A
Cited
US3627285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |