Patent US1894800A successfully refreshed from Google Patents.
US3357083A
Expired / Lapsed
US
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Method of making welded tubes heat exchangers with integral fins
Assignee: Babcock International Ltd
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Filing: 1965-04-06
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Granted: 1967-12-12
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Expires: 1985-04-06
Abstract
No abstract record available.
Inventors
- 👤 Wiehn Helmut
- 👤 Zech Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:59
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49393
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
THE METHOD OF MAKING A TUBE COMPRISING THE STEPS OF FORMING ONE SURFACE OF A METAL WITH A PAIR OF OUTWARDLY PROJECTING INTEGRAL WEDGE-SHAPED FINS AT POSITIONS SPACED SO THAT THE FINS WILL BE GENERALLY DIAMETRICALLY OPPOSED UPON SHAPING THE STRIP INTO TUBULAR FORM, FORMING THE OPPOSITE SURFACE OF THE STRIP WITH AN ARC-SHAPED GROOVE BELOW THE BASE OF EACH FIN, SHAPING THE METAL STRIP TO GENERALLY TUBULAR FORM WITH THE FINS ON THE OUTSIDE AND THE EDGES OF THE STRIP CLOSELY OPPOSED IN A CONTINUOUS LONGITUDINAL SEAM, AND WELD UNITING THE OPPOSED SEAM EDGES THE WIDTH OF EACH GROOVE CORRESPONDING TO THE WIDTH OF THE BASE OF THE ASSOCIATED FIN AND THE RADIUS OF EACH GROOVE CORRESPONDING TO THE INSIDE RADIUS OF THE FINISHED TUBE.
Claim 2
Independent Claim
126 words
THE METHOD OF MAKING A TUBE COMPRISING THE STEPS OF FORMING ONE SURFACE OF A METAL WITH A PAIR OF OUTWARDLY PROJECTING INTEGRAL WEDGE-SHAPED FINS AT POSITIONS SPACED SO THAT THE FINS WILL BE GENERALLY DIAMETRICALLY OPPOSED UPON SHAPING THE STRIP INTO TUBULAR FORM, FORMING THE OPPOSITE SURFACE OF THE STRIP WITH AN ARC-SHAPED GROOVE BELOW THE BASE OF EACH FIN, SHAPING THE METAL STRIP TO GENERALLY TUBULAR FORM WITH THE FINS ON THE OUTSIDE AND THE EDGES OF THE STRIP CLOSELY OPPOSED IN A CONTINUOUS LONGITUDINAL SEAM, AND WELD UNITING THE OPPOSED SEAM EDGES THE WIDTH OF EACH GROOVE CORRESPONDING TO THE WIDTH OF THE BASE OF THE ASSOCIATED FIN AND THE RADIUS OF EACH GROOVE CORRESPONDING TO THE INSIDE RADIUS OF THE FINISHED TUBE.
References Cited (Backward Citations)
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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) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |