US4426992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free standing stove
Assignee: Individual
•
Filing: 1982-05-28
•
Granted: 1984-01-24
•
Expires: 2002-05-28
Abstract
Abstract A free standing stove is provided which includes a firebox for initiating the combustion of fuel, and a secondary combustion chamber for continuing the combustion. A first conduit is provided for conveying air through a draft inlet damper and into the firebox. A second conduit is provided for conveying air into the secondary combustion chamber. A third conduit conveys the gasses of combustion from the secondary combustion chamber and out of the stove. A fourth conduit may also be included which would be mounted in thermal contact with the third conduit, the fourth conduit including a lower end and an upper end and being adapted to receive ambient air in its lower end and warm the air prior to discharging it out of the upper end.
Inventors
- 👤 Donald S. Martenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:23
CPC Classifications
F; F24; F24B; F24B5/00; F24B5/02; F24B5/028; F24B1/00; F24B1/02; F24B1/026
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
149 words
A free standing stove comprising: a firebox for initiating the combustion of fuel, said firebox including a bottom with a draft inlet therein; a first conduit for conveying air to said draft inlet; a draft inlet damper disposed in said draft inlet for controlling the flow of the air from said first conduit into the bottom of said firebox and for permitting combustion by-products to drop downwardly through said draft inlet damper and out of said firebox; a secondary combustion chamber for continuing the combustion, said secondary combustion chamber receiving the gasses of combustion from said firebox and further oxidizing the gasses, said secondary combustion chamber including a lower portion; a second conduit for conveying air into said lower portion of said secondary combustion chamber, said second conduit receiving air from said first conduit; and a third conduit for conveying the gasses of combustion from said secondary combustion chamber.
Claim 2
Dependent Claim
149 words
A free standing stove comprising: a firebox for initiating the combustion of fuel, said firebox including a bottom with a draft inlet therein; a first conduit for conveying air to said draft inlet; a draft inlet damper disposed in said draft inlet for controlling the flow of the air from said first conduit into the bottom of said firebox and for permitting combustion by-products to drop downwardly through said draft inlet damper and out of said firebox; a secondary combustion chamber for continuing the combustion, said secondary combustion chamber receiving the gasses of combustion from said firebox and further oxidizing the gasses, said secondary combustion chamber including a lower portion; a second conduit for conveying air into said lower portion of said secondary combustion chamber, said second conduit receiving air from said first conduit; and a third conduit for conveying the gasses of combustion from said secondary combustion chamber.
Claim 3
Dependent Claim
25 words
The stove of claim 1 wherein said draft inlet damper comprises a plate mounted to pivot with a shaft extending medially along said draft inlet.
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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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |