US3831247A
Expired / Lapsed
US
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Method of metallurgically bonding a internally finned heat exchange structure
Assignee: United Aircraft Products Inc
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Filing: 1971-11-22
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Granted: 1974-08-27
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Expires: 1991-11-22
Abstract
Abstract A METHOD OF ACHIEVING GOOD THERMAL INTERCHANGE BETWEEN A TUBE WALL AND A TUBE INSTALLED FIN ANNULUS, PROVIDING SECONDARY HEAT TRANSFER SURFACE, WHEREIN FIN CORRUGATIONS ARE METALLURGICALLY BONDED TO THE TUBE WALL BY A METHOD INHIBITING THE BONDING MATERIAL FROM FLOWING TO AND BLOCKING FLOW PATHS BETWEEN THE FIN CORRUGATIONS. A NEW FIN MATERIAL IS USED WHICH MAINTAINS OPEN FLOW PATHS THROUGH THE FIN MATERIAL EVEN WHEN THE MATERIAL IN STRIP FORM IS ROLLED TO A CIRCULAR OR ARCUATE CONFIGURATION. D R A W I N G
Inventors
- 👤 R Degroote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:01
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B21; B21D; B21D53/00; B21D53/02; B21D53/08; F; F28; F28F; F28F1/00; F28F1/10; F28F1/105; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49361
Claims Analysis
Total Claims: 0
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |