US4520740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion and heating equipment
Assignee: Coal Industry Patents Ltd
•
Filing: 1983-03-21
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Granted: 1985-06-04
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Expires: 2003-03-21
Abstract
Abstract Combustion and heating equipment includes a body with an underfeed stoker located in the lower part thereof. A jacket surrounds the body to define a heating space, different parts of which are interconnected by triangular ducts disposed in the gas pass. A screwfeeder is provided for the retort of the stoker and extends right through the body terminating in an inlet 36. A mobile hopper has an outlet for registry with the inlet and is refillable and interchangeable.
Inventors
- 👤 Brian M. Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:57
CPC Classifications
F; F23; F23M; F23M9/00; F23M9/06; F23B; F23B40/00; F23B40/04; F23B80/00; F23B80/04; F23K; F23K3/00; F23K3/10; F23K3/14; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/067
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
185 words
Combustion and heating equipment including a body having a lower part, a flue extending from said body an underfeed stoker located in said lower part, the stoker including a retort and a screwfeeder extending through the body to an inlet means, the screwfeeder incorporating a screw flight to reverse hand, a drive arrangement for the screwfeeder at one end thereof and a mobile fuel container at the other end thereof separate from said equipment, but connectible to said inlet means, a jacket extending around the body, a heating space defined between the body and the jacket, at least two ducts disposed within the body and spaced apart vertically above the underfeed stoker, said ducts extending through the body and positioned to interconnect different parts of the heating space, means for introducing a fluid to be heated and causing flow thereof through the heating space and through at least one of said ducts, an outlet means from the heating space and through the jacket for the fluid, and an overfire arch situated above the retort and below the ducts for reflecting heat back to the retort.
Claim 2
Dependent Claim
185 words
Combustion and heating equipment including a body having a lower part, a flue extending from said body an underfeed stoker located in said lower part, the stoker including a retort and a screwfeeder extending through the body to an inlet means, the screwfeeder incorporating a screw flight to reverse hand, a drive arrangement for the screwfeeder at one end thereof and a mobile fuel container at the other end thereof separate from said equipment, but connectible to said inlet means, a jacket extending around the body, a heating space defined between the body and the jacket, at least two ducts disposed within the body and spaced apart vertically above the underfeed stoker, said ducts extending through the body and positioned to interconnect different parts of the heating space, means for introducing a fluid to be heated and causing flow thereof through the heating space and through at least one of said ducts, an outlet means from the heating space and through the jacket for the fluid, and an overfire arch situated above the retort and below the ducts for reflecting heat back to the retort.
Claim 3
Dependent Claim
13 words
Equipment according to claim 1 in which each duct is of triangular section.
Claim 4
Dependent Claim
19 words
Equipment according to claim 1 in which successive ducts are orientated in different modes with respect to one another.
Claim 5
Dependent Claim
17 words
Equipment according to claim 3 in which successive ducts are arranged at right angles to one another.
Claim 6
Dependent Claim
26 words
Equipment according to claim 1 in which the apex of each triangular duct is arranged on the center line of the body in an upward direction.
Claim 7
Dependent Claim
19 words
Equipment according to claim 5 in which the included angle of the apex of each triangular duct is 60°.
Claim 8
Dependent Claim
21 words
Equipment according to claim 1 in which the overfire arch is attached to the duct means nearest to the underfeed stoker.
Claim 9
Dependent Claim
13 words
Equipment according to claim 1 in which the mobile fuel container is sealable.
Claim 10
Dependent Claim
34 words
Equipment according to claim 8 in which the container is in the form of a hopper having a sealable inlet means and an outlet means for registering with the inlet means of the screwfeeder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |