Patent US4434784A successfully refreshed from Google Patents.
US4434784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viewing apparatus for a chimney
Assignee: Individual
•
Filing: 1983-05-23
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Granted: 1984-03-06
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Expires: 2003-05-23
Abstract
Abstract Apparatus for viewing the interior of a working chimney so that smoke patterns and the condition of the chimney walls can be continually monitored without the need of discontinuing the operation of a connected stove. The viewing apparatus is rendered airtight so that a fire extinguisher operably connected thereto can fire dry chemicals directly into the chimney in the event a chimney fire is detected.
Inventors
- 👤 Frederic D. Van Patten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:44
CPC Classifications
F; F23; F23J; F23J13/00; A; A62; A62C; A62C3/00; A62C3/04; F23M; F23M11/00; F23M11/04; F23M11/042
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
Apparatus for visually monitoring the vent chamber of a chimney while the chimney is drawing exhaust gases through the flue of a stove that includes a hollow member sealed in one wall of the chimney below the flue entrance of the stove, said hollow member having an inside end face passing into the vent chamber of the chimney and an outer end face protruding beyond said one wall of the chimney, a bracket means angularly disposed within the vent chamber adjacent to the inside end face of said hollow member, a mirror means supported upon the said bracket within the vent chamber to permit the chamber to be viewed through the hollow member, an observation door having a transparent window therein, said door being removably mounted over said outside end face of said hollow member, and sealing means acting between said door and said hollow member to provide an airtight joint therebetween when the door is in a closed position whereby said hollow member provides an airtight passage communicating with the vent chamber.
Claim 2
Dependent Claim
173 words
Apparatus for visually monitoring the vent chamber of a chimney while the chimney is drawing exhaust gases through the flue of a stove that includes a hollow member sealed in one wall of the chimney below the flue entrance of the stove, said hollow member having an inside end face passing into the vent chamber of the chimney and an outer end face protruding beyond said one wall of the chimney, a bracket means angularly disposed within the vent chamber adjacent to the inside end face of said hollow member, a mirror means supported upon the said bracket within the vent chamber to permit the chamber to be viewed through the hollow member, an observation door having a transparent window therein, said door being removably mounted over said outside end face of said hollow member, and sealing means acting between said door and said hollow member to provide an airtight joint therebetween when the door is in a closed position whereby said hollow member provides an airtight passage communicating with the vent chamber.
Claim 3
Dependent Claim
41 words
The apparatus of claim 1 that further includes a flexible boot that passes over the outside end face of the hollow member and connecting means for securing the door to the boot when the door is placed in a closed position.
Claim 4
Dependent Claim
53 words
The apparatus of claim 2 wherein said door further includes an axially disposed flange that is slidably received within the boot to bias the boot against the inner wall of the hollow member when the door is in a locked position thereby sealing the boot against the inner wall of the hollow member.
Claim 5
Dependent Claim
37 words
The apparatus of claim 1 wherein said bracket means further includes a base seated in the hollow member and a locating lug for engaging a wall of said chimney to position the bracket in the vent chamber.
Claim 6
Dependent Claim
39 words
The apparatus of claim 1 that further includes a fire extinguisher connected into the hollow member for discharging fire extinguishing chemicals into the airtight hollow member whereby chemicals introduced into the hollow member are drawn rapidly into the chimney.
References Cited (Backward Citations)
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Cited
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US1708987A
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US1889483A
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US2297808A
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US2408495A
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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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |