Patent US1434602A successfully refreshed from Google Patents.
US4448348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced air flue heater device
Assignee: Individual
•
Filing: 1982-08-19
•
Granted: 1984-05-15
•
Expires: 2002-08-19
Abstract
Abstract This device is a heat capturing, recirculating economizer ventilator, which is sheet metal and is in kit form, to be assembled by the user, for being applied to standing-fireplaces, stoves, and the like. Primarily, it consists of a housing encapsulating a segmented helical configuration surrounding a vertical smooth flue pipe, which automatically forces room ambient air by virtue of a motor driven centrifugal blower, spirally downward on a double path toward and through diffusers, for the purpose of distributing heated air into a space to be heated.
Inventors
- 👤 Malcolm A. Bidwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:43
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/026; F24; F24B; F24B7/00; F24B7/005; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0008; Y; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
142 words
A flue heat reclaimer for woodburning stoves comprising a helical shaped divider ring adapted to fit over said flue with the inner edge adjacent thereto, said helical divider ring being divided into sections each being semi-circular in configuration, said sections being joined together by arcuate splice plate means, an outer cylindrical housing fitted over said helical divider ring, said housing including a top pair of semi-circular plates and means for mounting said plates to said housing, wherein the upper end of said helical divider ring is mounted to one of said top plates, a thermostatically controlled blower means being mounted on the upper end of said housing, said blower means being mounted to form a double air flow path in the helical divider ring, said housing further including bottom walls and plural air outlet means at the lower end of said housing.
References Cited (Backward Citations)
US542650A
Cited
US2468909A
Cited
US2619022A
Cited
US4147303A
Cited
US4300527A
Cited
US4381819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |