US4069807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot air heater
Assignee: EIDP Inc
•
Filing: 1976-04-12
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Granted: 1978-01-24
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Expires: 1996-04-12
Abstract
Abstract A high efficiency hot air heater is disclosed in which the combustion products of a flame are forced through water in a contacting device. The combustion products and whatever moisture is evaporated are passed through a heat exchanger to heat air such as for a home. The moisture which condenses in the heat exchanger is returned to the water contactor and the combustion products are vented to the atmosphere. Due to the low temperature of the combustion products and evaporated water, a plastic heat exchanger can be used, which is low enough in cost to permit using a large unit for maximum heat utilization.
Inventors
- 👤 Martval John Hartig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:03
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065; F24H8/00; F28; F28F; F28F21/00; F28F21/06; F28F21/065; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
A heater comprising a burner, means to conduct combustion products into contact with a liquid comprising water, said means being sized to provide combustion products at a temperature of from about 175° F to about 190° F, a blower adapted to transport from said burner through said liquid and urge said combustion products through a heat exchanger, which is made from a thermoplastic resin, which has from 3 to 10 square feet of air surface per 1,000 Btu per hour burner capacity, which heat exchanger is adapted to exchange the heat from said combustion products with forced air.
Claim 2
Dependent Claim
98 words
A heater comprising a burner, means to conduct combustion products into contact with a liquid comprising water, said means being sized to provide combustion products at a temperature of from about 175° F to about 190° F, a blower adapted to transport from said burner through said liquid and urge said combustion products through a heat exchanger, which is made from a thermoplastic resin, which has from 3 to 10 square feet of air surface per 1,000 Btu per hour burner capacity, which heat exchanger is adapted to exchange the heat from said combustion products with forced air.
Claim 3
Dependent Claim
112 words
A heater comprising a burner, a chimney adjacent said burner which chimney protrudes through a body of water into a bubble cap, means to maintain said water at a predetermined level such that the combustion products from said burner are at a temperature of from about 175° F to about 190° F, a blower adapted to transport combustion products from said burner through said water and urge said combustion products through a heat exchanger, which is made from a thermoplastic resin, which has from 3 to 10 square feet of air surface per 1,000 Btu per hour of burner capacity is adapted to exchange heat from said combustion products with forced air.
Claim 4
Dependent Claim
112 words
A heater comprising a burner, a chimney adjacent said burner which chimney protrudes through a body of water into a bubble cap, means to maintain said water at a predetermined level such that the combustion products from said burner are at a temperature of from about 175° F to about 190° F, a blower adapted to transport combustion products from said burner through said water and urge said combustion products through a heat exchanger, which is made from a thermoplastic resin, which has from 3 to 10 square feet of air surface per 1,000 Btu per hour of burner capacity is adapted to exchange heat from said combustion products with forced air.
Claim 5
Dependent Claim
24 words
The heater of claim 2 wherein means are provided to remove condensate from said heat exchanger and return said condensate to said bubble cap.
Claim 6
Dependent Claim
47 words
The heater of claim 3 wherein there are provided a plurality of thermoplastic resin passages adapted to conduct air, and there are provided adjacent thereto passages adapted to conduct combustion products in a direction essential at right angles to the direction in which the air is conducted.
Claim 7
Dependent Claim
63 words
A process of heating air comprising burning a fuel to produce combustion products, passing the combustion products into contact with a liquid comprising water to produce a gas mixture of moisture and combustion products having a temperature of from about 175° F to about 190° F and passing said gas mixture through a heat exchanger made of a thermoplastic resin to heat air.
Claim 8
Dependent Claim
63 words
A process of heating air comprising burning a fuel to produce combustion products, passing the combustion products into contact with a liquid comprising water to produce a gas mixture of moisture and combustion products having a temperature of from about 175° F to about 190° F and passing said gas mixture through a heat exchanger made of a thermoplastic resin to heat air.
Claim 9
Dependent Claim
27 words
The process of claim 5 wherein moisture is condensed in the heat exchanger and returned to liquid comprising water through which is contacted with the combustion products.
Claim 10
Dependent Claim
33 words
The process of claim 5 wherein the heat exchanger is operated in a plurality of stages with the flow of air at essential right angles to the flow of moisture and combustion products.
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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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |