US3768447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Economizer with flues connected in series
Assignee: Svenska Maskinverken AB
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Filing: 1972-03-16
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Granted: 1973-10-30
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Expires: 1992-03-16
Abstract
Abstract An economizer, comprising a plurality of vertical gas passageways disposed with their axes parallel to each other and having inlets and outlets therein so that a heated gas can flow serially therethrough, the walls of said vertical gas passageways comprising a plurality of tubes that are disposed in essentially parallel relationship to each other and welded together to form screens, the interior of said vertical gas passageways containing vertical screens composed of a plurality of tubes arranged in parallel relationship, and means for passing a cooling fluid in series through said screens and tubes.
Inventors
- 👤 G Kallstrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:49
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
An economizer, comprising in combination a. a plurality of vertical gas passageways disposed with their axes parallel to each other and having inlets and outlets therein so that a heated gas can flow serially therethrough, b. the walls of said vertical gas passageways comprising a plurality of tubes that are disposed in essentially parallel relationship to each other and welded together to form screens, c. the interior of said vertical gas passageways containing vertical screens composed of a plurality of tubes arranged in parallel relationship, and d. means for passing a cooling fluid in series through the screens of (c) and the tubes of (d).
Claim 2
Dependent Claim
105 words
An economizer, comprising in combination a. a plurality of vertical gas passageways disposed with their axes parallel to each other and having inlets and outlets therein so that a heated gas can flow serially therethrough, b. the walls of said vertical gas passageways comprising a plurality of tubes that are disposed in essentially parallel relationship to each other and welded together to form screens, c. the interior of said vertical gas passageways containing vertical screens composed of a plurality of tubes arranged in parallel relationship, and d. means for passing a cooling fluid in series through the screens of (c) and the tubes of (d).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |