Patent US3768457A successfully refreshed from Google Patents.
US3768457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireplace construction
Assignee: MAJESTIC PRODUCTS COMPANY
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Filing: 1972-12-13
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Granted: 1973-10-30
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Expires: 1992-12-13
Abstract
Abstract A fireplace comprising a conical hood connected at its upper end to a smoke pipe collar by means of a bead-flange clamp joint. The joint provides a smoke seal while avoiding the need for a continuous circumferential weld. The joint surfaces are devoid of internal crevices or projections that would obstruct air flow or tend to collect moisture or other corrosive materials.
Inventors
- 👤 R Beasey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:30
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
191 words
A fireplace comprising a base pan, an upwardly tapering sheet metal hood positioned on said pan and having an inverted frustroconical upper end, and a cylindrical sheet metal smoke pipe collar connected to the upper end of said hood; the lower peripheral edge area of said collar including a first annular wall extending outwardly and downwardly at an acute angle to the main collar side wall surface, a second annular wall extending from the outer edge of the first wall inwardly and upwardly along the first wall''s inner surface to provide A closed moistureresistant joint, a third annular wall extending from the inner edge of the second wall downwardly for a distance corresponding to the wall thickness of the hood, and a fourth annular wall extending from the third wall outwardly and downwardly parallel to the second wall to cooperate therewith in forming an annular groove; said hood having its upper end extending into the annular groove; said second and third walls having sufficient facial contact with the hood wall to form a smoke seal; the aforementioned acute angle being sufficient to prevent pull out of the collar from the hood.
Claim 2
Dependent Claim
191 words
A fireplace comprising a base pan, an upwardly tapering sheet metal hood positioned on said pan and having an inverted frustroconical upper end, and a cylindrical sheet metal smoke pipe collar connected to the upper end of said hood; the lower peripheral edge area of said collar including a first annular wall extending outwardly and downwardly at an acute angle to the main collar side wall surface, a second annular wall extending from the outer edge of the first wall inwardly and upwardly along the first wall''s inner surface to provide A closed moistureresistant joint, a third annular wall extending from the inner edge of the second wall downwardly for a distance corresponding to the wall thickness of the hood, and a fourth annular wall extending from the third wall outwardly and downwardly parallel to the second wall to cooperate therewith in forming an annular groove; said hood having its upper end extending into the annular groove; said second and third walls having sufficient facial contact with the hood wall to form a smoke seal; the aforementioned acute angle being sufficient to prevent pull out of the collar from the hood.
Claim 3
Dependent Claim
155 words
A fireplace comprising a base, an upwardly tapering sheet material hood positioned on said base and having a convergent upper end, and a sheet material smoke pipe collar connected to the upper end of said hood; the lower peripheral edge area of said collar including a first annular wall extending outwardly and downwardly at an acute angle to the main collar side wall surface, a second annular wall double back along the under surface of the first wall to cooperate therewith in forming a bead, a third annular wall extending from the inner edge of the second wall downwardly for a distance corresponding to the wall thickness of the hood, and a fourth annular wall extending from the third wall outwardly and downwardly parallel to the second wall to cooperate therewith in forming an annular groove; said hood having its upper end extending into the annular groove to cooperate therewith in forming a smoke seal.
Claim 4
Dependent Claim
155 words
A fireplace comprising a base, an upwardly tapering sheet material hood positioned on said base and having a convergent upper end, and a sheet material smoke pipe collar connected to the upper end of said hood; the lower peripheral edge area of said collar including a first annular wall extending outwardly and downwardly at an acute angle to the main collar side wall surface, a second annular wall double back along the under surface of the first wall to cooperate therewith in forming a bead, a third annular wall extending from the inner edge of the second wall downwardly for a distance corresponding to the wall thickness of the hood, and a fourth annular wall extending from the third wall outwardly and downwardly parallel to the second wall to cooperate therewith in forming an annular groove; said hood having its upper end extending into the annular groove to cooperate therewith in forming a smoke seal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |