US4222349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stack exhaust heat recycling system
Assignee: Individual
•
Filing: 1978-04-24
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Granted: 1980-09-16
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Expires: 1998-04-24
Abstract
Abstract A stack exhaust heat recycling system utilizing the heat content of exhaust gases passing through a smoke stack to the ambient atmosphere. The stack includes an inner shell defining a passage to carry the exhaust gases without restrictive draft. Surrounding this shell in any desired configuration is tubing carrying fluids (liquids, gas or oils). Surrounding the tubing is an intermediate shell, insulation and an outer shell. During the passage of the fluid through the tubing, transfer of heat occurs from the gases to the fluid so that its temperature is elevated for use, e.g., as hot water, thus eliminating or supplementing a hot water heater. Other uses requiring elevation of the temperature of water or gas may be similarly utilized.
Inventors
- 👤 Bertram Z. Kadan
- 👤 Seymour Kadan
- 👤 Alvin Kadan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:42
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0007; F28D21/0008
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A stack exhaust heat recycling system utilizing the heat present in exhaust gases to heat a fluid which comprises an exhaust passage defined by a first shell; an intermediate shell encircling said first shell defining a space therebetween; tubing means positioned within the space to circulate the fluid proximate the first shell; and insulation means proximate the tubing means but on the other side of the intermediate shell whereby heat is transferred from the exhaust gases into the circulation means but is substantially retained by the said means, whereby fluids may be elevated in temperature prior to the introduction to a desired position within a system.
Claim 2
Dependent Claim
106 words
A stack exhaust heat recycling system utilizing the heat present in exhaust gases to heat a fluid which comprises an exhaust passage defined by a first shell; an intermediate shell encircling said first shell defining a space therebetween; tubing means positioned within the space to circulate the fluid proximate the first shell; and insulation means proximate the tubing means but on the other side of the intermediate shell whereby heat is transferred from the exhaust gases into the circulation means but is substantially retained by the said means, whereby fluids may be elevated in temperature prior to the introduction to a desired position within a system.
Claim 3
Dependent Claim
43 words
The invention according to claim 1, the tubing passing upwardly in a vertical direction along the length of the shell and then being disposed downwardly in a vertical direction, parallel to the first portion, the final vertical member being connected to the outlet.
Claim 4
Dependent Claim
43 words
The invention according to claim 1, the tubing including a vertical member passing upwardly to the top of the shell, and thence forming a series of coils, passing around the shell and ultimately terminating at the outlet at the bottom of the shell.
Claim 5
Dependent Claim
21 words
The invention according to claim 1, the first shell being a smoke stack, a collar positioned beneath and supporting said stack.
Claim 6
Dependent Claim
35 words
The invention according to claim 4, the upper edge of the collar including an upstanding rim received within the stack, the collar further containing means for accommodating inlet and outlet portions of the circulation means.
Claim 7
Dependent Claim
21 words
The invention according to claim 2, the first shell being a smoke stack, a collar positioned beneath and supporting said stack.
Claim 8
Dependent Claim
21 words
The invention according to claim 3, the first shell being a smoke stack, a collar positioned beneath and supporting said stack.
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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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |