US4079702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Economizer utilizing exhaust gas
Assignee: Tokushu Shunsetsu KK
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Filing: 1976-08-26
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Granted: 1978-03-21
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Expires: 1996-08-26
Abstract
Abstract The present invention discloses an economizer for absorbing heat of combustion products, wherein the surfaces of a series of continuous tubes extended through an exhaust gas pipe or duct are lined with glass pipes, the clearance between the exhaust pipe or duct wall and the tubes extended therethrough is sealed with gaskets, and water is circulated through the tubes.
Inventors
- 👤 Takaaki Furukawa
- 👤 Kenzi Ozaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:57
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/1807; F22D; F22D1/00; F22D1/02; F22D1/04; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D7/00; F28D7/0058; F28D7/08; F28D7/082; F28F; F28F19/00; F28F19/02; F28D2021/0019; F28D2021/0061; F28D2021/0064; F28F2230/00; Y; Y02; Y02E; Y02E20/00; Y02E20/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
An economizer comprising an exhaust pipe having its inner wall surface coated with a heat resisting and corrosion-resisting material for transmitting high-temperatured exhaust gases containing corrosive materials such as SOx, a tube communicated with a water supply and extended through the exhaust pipe with clearance and bent to form a series of continuous parallel tube sections, said tube being closely lined with glass pipes by heat application on its surfaces inside the exhaust pipes so that the covering glass pipes are exposed to the exhaust gases, at least one heat-resisting and corrosion-resisting gasket for sealing inserted into each clearances between the tubes and the wall of the exhaust pipe, said gasket being securely held in position with a gasket retainer pressed forcibly against the gasket with a bolt and a bridge washer capable of bridging adjacent gasket retainers, and an outer casing or pipe fitted over said exhaust pipe so as to airtightly enclose therein the bends of the tubes extended out of the exhaust pipe.
Claim 2
Dependent Claim
166 words
An economizer comprising an exhaust pipe having its inner wall surface coated with a heat resisting and corrosion-resisting material for transmitting high-temperatured exhaust gases containing corrosive materials such as SOx, a tube communicated with a water supply and extended through the exhaust pipe with clearance and bent to form a series of continuous parallel tube sections, said tube being closely lined with glass pipes by heat application on its surfaces inside the exhaust pipes so that the covering glass pipes are exposed to the exhaust gases, at least one heat-resisting and corrosion-resisting gasket for sealing inserted into each clearances between the tubes and the wall of the exhaust pipe, said gasket being securely held in position with a gasket retainer pressed forcibly against the gasket with a bolt and a bridge washer capable of bridging adjacent gasket retainers, and an outer casing or pipe fitted over said exhaust pipe so as to airtightly enclose therein the bends of the tubes extended out of the exhaust pipe.
Claim 3
Dependent Claim
34 words
An economizer as set forth in claim 11 wherein air under pressure higher than the pressure of the exhaust gases is forced into the space defined between said exhaust pipe and said outer casing.
Claim 4
Dependent Claim
56 words
An economizer as set forth in claim 1 wherein, in said space defined between said exhaust pipe and said outer casing, the outer surfaces of said exhaust pipe, the inner wall surfaces of said outer casing and the outer surfaces of the tube extended out of said exhaust pipe are applied with heat-resisting and corrosion-resisting coatings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |