US4381819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue heat reclaimer
Assignee: Individual
•
Filing: 1981-05-21
•
Granted: 1983-05-03
•
Expires: 2001-05-21
Abstract
Abstract A flue heat reclaimer is constructed to be mounted on the exterior of a flue duct of a heater and provide a spiral-shaped heat transfer passage extending around the flue duct. A fan causes air to flow through the heat transfer passage so that the temperature of this air is elevated by reason at its extended heat transfer relationship with the flue duct.
Inventors
- 👤 Ralph J. Paolino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:10
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0008; F24; F24B; F24B7/00; F24B7/005; F28D7/00; F28D7/02; F28D7/026; Y; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
249 words
For use with a home heater or the like having a cylindrical flue duct for the hot flue gases from the heater, a flue heat reclaimer comprising a spiral-shaped divider adapted to fit over said flue duct with its inner edge adjacent thereto, a cylindrical outer tube adapted to be mounted on said flue duct and having a diameter greater than the diameter of said flue duct, said divider being adapted to fit within said outer tube with the outer edge of the divider adjacent thereto, a first end cap enclosing one end of said outer tube, a second end cap enclosing the other end of said outer tube, said end caps, said outer tube, and said divider cooperating with the exterior of said flue duct to define a spiral-shaped heat exchange passage extending around the exterior of said flue duct, means providing an inlet to one end of said heat exchange passage, means providing an outlet from the other end of said heat exchange passage, and fan means for causing air to flow successively from said inlet means through said heat exchange passage and said outlet means whereby the temperature of the air flowing through said heat exchange passage is raised by means of its extended heat exchange relationship with the exterior of said flue duct, said divider being made of a strip bent longitudinally with one portion extending along the exterior of said flue duct and the other portion comprised of tabs defining the heat exchange passage.
Claim 2
Dependent Claim
21 words
A flue heat reclaimer according to claim 1 wherein said strip is anchored at its ends only to said flue duct.
Claim 3
Dependent Claim
261 words
For use with a home heater or the like having a cylindrical flue duct for the hot flue gases from the heater, a flue heat reclaimer comprising a spiral-shaped divider adapted to fit over said flue duct with its inner edge adjacent thereto, a cylindrical outer tube adapted to be mounted on said flue duct and having a diameter greater than the diameter of said flue duct, said divider being adapted to fit within said outer tube with the outer edge of the divider adjacent thereto, a first end cap enclosing one end of said outer tube, a second end cap enclosing the other end of said outer tube, said end caps, said outer tube, and said divider cooperating with the exterior of said flue duct to define a spiral-shaped heat exchange passage extending around the exterior of said flue duct, means providing an inlet to one end of said heat exchange passage, means providing an outlet from the other end of said heat exchange passage, means restricting air flow through said spiral-shaped passage, and fan means for causing air to flow successively from said inlet means through said heat exchange passage and said outlet means whereby the temperature of the air flowing through said heat exchange passage is raised by means of its extended heat exchange relationship with the exterior of said flue duct, said divider being made of a strip bent longitudinally with one portion extending along the exterior of said flue duct and the other portion comprised of tabs defining the heat exchange passage and said restricting means.
Claim 4
Dependent Claim
26 words
A flue heat reclaimer according to claim 3 wherein said end caps have a split construction so that they can be assembled over said flue duct.
Claim 5
Dependent Claim
44 words
A flue heat reclaimer according to claim 3 including means responsive to the temperature in said heat exchange chamber for controlling operation of said fan means including a temperature sensor mounted to sense the temperature of the air flowing through said heat exchange chamber.
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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) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |