US4258783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiling heat transfer surface, method of preparing same and method of boiling
Assignee: Borg Warner Corp
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Filing: 1979-02-08
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Granted: 1981-03-31
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Expires: 1999-02-08
Abstract
Abstract Improved nucleate boiling cavities are provided in a heat exchange surface by mechanically forming indentations on the heat transfer surface and then electrodepositing a metal on the pitted surface at a high current density followed by strengthening at lower current densities. Also described is a method of transferring heat from a warm fluid to a boiling liquid utilizing the improved nucleate boiling structure.
Inventors
- 👤 Clarence E. Albertson
- 👤 George M. Nichols
- 👤 John N. Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:47
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; C; C25; C25D; C25D5/00; C25D5/34; C25D7/00; C25D7/04; F22; F22B; F22B37/00; F22B37/02; F22B37/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
Heat exchange apparatus comprising a heat conductive wall having one surface adapted to be in contact with a boiling liquid and the other surface adapted to be in contact with a warm fluid, said one surface being formed by (1) mechanically forming non-continuous pits or craters on said surface; (2) electrodepositing a metal on the thus pitted surface at a high current density to produce dendrites and form honeycomb-like nucleate boiling surfaces on said surface; and (3) subsequently plating said dendrites at a lower current density to coat said dendrites with a metal plate.
Claim 2
Dependent Claim
94 words
Heat exchange apparatus comprising a heat conductive wall having one surface adapted to be in contact with a boiling liquid and the other surface adapted to be in contact with a warm fluid, said one surface being formed by (1) mechanically forming non-continuous pits or craters on said surface; (2) electrodepositing a metal on the thus pitted surface at a high current density to produce dendrites and form honeycomb-like nucleate boiling surfaces on said surface; and (3) subsequently plating said dendrites at a lower current density to coat said dendrites with a metal plate.
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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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |