US3871407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1973-06-20
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Granted: 1975-03-18
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Expires: 1993-06-20
Abstract
Abstract Heat-exchange at least one heat-exchange tube accommodating a centrally disposed, longitudinally extending core having at least three radially extending ribs. The outer ends of the ribs are shaped as wedges whose acute ends extend radially from the center of the core, the ends of the ribs being press-fitted into the tube wall on the inner side thereof to a depth equal to the height of the wedges.
Inventors
- 👤 Alexandr Vasilievich Bykov
- 👤 Igor Martynovich Kalnin
- 👤 Vladimir Nikolaevich Krotkov
- 👤 Fedor Nikolaevich Dyachkov
- 👤 Viktor Ivanovich Plokhov
- 👤 Mikhail Fedotovich Golovinov
- 👤 Veniamin Kuzmich Erokhov
- 👤 Jury Stepanovich Starostin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:54
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F15; F15D; F15D1/00; F15D1/02; F15D1/06; F15D1/065; F28F1/00; F28F1/10; F28F1/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
96 words
A heat-exchange apparatus comprising: at least one heatexchange tube; a centrally disposed, longitudinally extending core accommodated in said tube; at least three radially extending ribs on each core, the outer ends of said ribs being shaped as wedges having pointed ends directed radially away from the center of said core, and said ribs being press-fitted with said ends into the inner wall of said tube to a depth equal to the height of said wedges, thereby raising the contact pressure between said outer rib ends and said inner tube wall, with concomitant increased contact heat-exchange characteristics.
Claim 2
Dependent Claim
96 words
A heat-exchange apparatus comprising: at least one heatexchange tube; a centrally disposed, longitudinally extending core accommodated in said tube; at least three radially extending ribs on each core, the outer ends of said ribs being shaped as wedges having pointed ends directed radially away from the center of said core, and said ribs being press-fitted with said ends into the inner wall of said tube to a depth equal to the height of said wedges, thereby raising the contact pressure between said outer rib ends and said inner tube wall, with concomitant increased contact heat-exchange characteristics.
Claim 3
Dependent Claim
18 words
The apparatus as defined in claim 1, wherein the lateral sides of said ribs have a rough microrelief.
References Cited (Backward Citations)
US2960114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |