US3812797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke eliminator dump chute door
Assignee: Temperature Control Inc
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Filing: 1972-10-26
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Granted: 1974-05-28
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Expires: 1992-10-26
Abstract
Abstract An apparatus for preventing smoke leakage from chimneys provided with dump chute doors is provided. The device includes an enclosure encircling the dump chute door, and an access door in the enclosure providing access to the dump chute door. Means is provided for subjecting the interior of the enclosure to a slight positive pressure to overcome any position pressure experienced in the chimney.
Inventors
- 👤 R Wieken
- 👤 H Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:16
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/44; F23G5/442; F23M; F23M11/00; F23M11/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
An apparatus for preventing the escape of chimney gases through dump chute doors extending through chimney apertures, the apparatus including: an enclosure encircling the dump chute door on the outside of the chimney and sealed relative to the chimney, an access door in said enclosure providing access to the dump chute door, means providing a slightly above atmospheric pressure within said enclosure.
Claim 2
Independent Claim
62 words
An apparatus for preventing the escape of chimney gases through dump chute doors extending through chimney apertures, the apparatus including: an enclosure encircling the dump chute door on the outside of the chimney and sealed relative to the chimney, an access door in said enclosure providing access to the dump chute door, means providing a slightly above atmospheric pressure within said enclosure.
Claim 3
Dependent Claim
18 words
The structure of claim 1 and in which said means providing an above atmospheric pressure comprises a fan.
Claim 4
Dependent Claim
15 words
The structure of claim 1 and including an incinerator at the base of the chimney.
Claim 5
Dependent Claim
12 words
The structure of claim 3 and including a burner in said incinerator.
Claim 6
Dependent Claim
29 words
The structure of claim 3 and including an electrically actuated burner, and in which the means providing a slightly above atmospheric pressure is electrically actuated simultaneously with said burner.
Claim 7
Dependent Claim
51 words
The structure of claim 1 and in which said enclosure is divided into two compartment portions, one of which includes an inlet an outlet to the other compartment portion, and a blower therebetween forming the means for producing a slightly elevated pressure, and the other compartment portion including the access door.
Claim 8
Dependent Claim
29 words
The structure of claim 6 and in which the said one compartment portion is positioned above the said one compartment portion is positioned above the said other compartment portion.
Claim 9
Dependent Claim
17 words
The structure of claim 6 and in which the two compartment portions are separated by a partition.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |