US3693713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned tube and method of manufacture
Assignee: Peerless of America Inc
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Filing: 1970-07-16
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Granted: 1972-09-26
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Expires: 1990-07-16
Abstract
Abstract A finned tube which has a helical surface element formed by displacement of a portion of the tube wall and securing to the distal end edge of the surface element a helical extension member so that the surfaces of the latter lie substantially in co-planar relation to the surface element, the extension member functioning to increase the heat transfer rate per unit length of tube.
Inventors
- 👤 Frederick J Stahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:15
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
A finned heat exchanger conduit comprising: a. a hollow body portion; b. a plurality of longitudinally spaced, radially extending external surface elements connected to the body portion; c. a plurality of extension members secured to the distal end portions of said surface elements so that the extension members lie in co-extensive relationship with the surface elements; and d. said extension members comprise two integral sections disposed in spaced substantially parallel relationship to each other and secured to the surface elements in a fluid tight manner to define with the latter chamber means.
Claim 2
Dependent Claim
92 words
A finned heat exchanger conduit comprising: a. a hollow body portion; b. a plurality of longitudinally spaced, radially extending external surface elements connected to the body portion; c. a plurality of extension members secured to the distal end portions of said surface elements so that the extension members lie in co-extensive relationship with the surface elements; and d. said extension members comprise two integral sections disposed in spaced substantially parallel relationship to each other and secured to the surface elements in a fluid tight manner to define with the latter chamber means.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 in which chamber means contains liquid metal.
Claim 4
Dependent Claim
73 words
The apparatus of claim 1 wherein said body portion is tubular and wherein said radially extending, external surface elements are formed integrally with the tubular body portion and arranged to helically encircle the tubular body and said extension members consist of a folded-flat strip having a helical configuration complementary to the helix of the extending external surface elements and secured along the free edge portions to the distal portions of the surface elements.
References Cited (Backward Citations)
US927702A
Cited
US3148441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |