Patent US4019491A successfully refreshed from Google Patents.
US4019491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
No down draft chimney throat
Assignee: Individual
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Filing: 1975-04-07
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Granted: 1977-04-26
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Expires: 1995-04-07
Abstract
Abstract This is a unique and improved throat for chimneys such as chimneys used in connection with fireplaces which features a complete former damper and throat attached to the sides of the chimney hood portion immediately above the firebox in such manner as to provide a chamber into which downdrafts from the chimney will be directed so as to be diverted back up the chimney and wherein the draft from the firebox or combustion chamber together with smoke will be diverted up the chimney so that if diverted otherwise by downdraft it will enter the air shelf and return up the chimney; the invention is further characterized by the capability of being formed of cardboard or the like in an inexpensive manner which will burn away, and leave the masonry which has been formed thereabout as the final unit; the air shelf is provided with unique cleaning potential through provision of a washing opening.
Inventors
- 👤 Nicholas DiRocco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:47
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/189; F24B1/1895
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
A no down draft chimney throat located beneath a chimney flue comprising: a chimney hood assembly containing no damper lid; and an air shelf consisting of a trough and located within the chimney hood assembly with one side and two ends adhering to said chimney hood assembly and one side not adhering to said chimney hood assembly so as to provide a passage for smoke between the said assembly and said non-adhering side, wherein the non-adhering side edge is positioned outside an imaginary vertical line drawn down the opening of the chimney flue so that water or debris or air coming down the chimney flue will not directly strike the outer edge of said non-adhering side, and wherein the said trough is provided with a cleaning hole adjacent its lower portion, the said cleaning hole being cooperative with another hole located in the outside of the chimney.
Claim 2
Dependent Claim
147 words
A no down draft chimney throat located beneath a chimney flue comprising: a chimney hood assembly containing no damper lid; and an air shelf consisting of a trough and located within the chimney hood assembly with one side and two ends adhering to said chimney hood assembly and one side not adhering to said chimney hood assembly so as to provide a passage for smoke between the said assembly and said non-adhering side, wherein the non-adhering side edge is positioned outside an imaginary vertical line drawn down the opening of the chimney flue so that water or debris or air coming down the chimney flue will not directly strike the outer edge of said non-adhering side, and wherein the said trough is provided with a cleaning hole adjacent its lower portion, the said cleaning hole being cooperative with another hole located in the outside of the chimney.
Claim 3
Dependent Claim
114 words
A no down draft chimney throat located beneath a chimney flue comprising: a chimney hood assembly containing no damper lid, and an air shelf consisting of a trough and located within a chimney hood assembly with one side and two ends adhering to said chimney hood assembly, and one side not adhering to said chimney hood assembly so as to provide a passage for smoke between said chimney hood assembly and said non adhering side, and wherein a trough support rod is provided from the side of the chimney hood assembly adjacent said trough side which is not adhering to said chimney hood assembly to the opposite side of the said chimney hood assembly.
Claim 4
Dependent Claim
114 words
A no down draft chimney throat located beneath a chimney flue comprising: a chimney hood assembly containing no damper lid, and an air shelf consisting of a trough and located within a chimney hood assembly with one side and two ends adhering to said chimney hood assembly, and one side not adhering to said chimney hood assembly so as to provide a passage for smoke between said chimney hood assembly and said non adhering side, and wherein a trough support rod is provided from the side of the chimney hood assembly adjacent said trough side which is not adhering to said chimney hood assembly to the opposite side of the said chimney hood assembly.
References Cited (Backward Citations)
FR340078A
Cited
GB190404055A
Cited
US1273695A
Cited
US1755771A
Cited
US1935751A
Cited
US2385450A
Cited
GB742363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |