US4880054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger tube for evaporation or condensation
Assignee: Mitsubishi Electric Corp
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Filing: 1988-09-07
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Granted: 1989-11-14
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Expires: 2008-09-07
Abstract
Abstract A heat exchanger tube for evaporation or condensation, comprising: projected parts having cavities and provided on at least one of the inner wall surface and the outer wall surface of a tubular body, and plain parts formed on the same surface as the projected parts so that the projected parts and the plain parts mingle together.
Inventors
- 👤 Takayuki Yoshida
- 👤 Masao Fujii
- 👤 Kiyoshi Sakuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:20
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046; F28F2255/00; F28F2255/18; Y; Y10; Y10S; Y10S165/00; Y10S165/913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A heat exchanger tube for evaporation or condensation, said heat exchanger tube comprising: (a) projected parts having cavities in which bubble nuclei form, said projected parts being provided on at least one of the inner wall surface and the outer wall surface of a tubular body, and (b) plain parts formed on the same surface as the projected parts so that the projected parts and the plain parts are interspersed, wherein: (c) the projected parts and the cavities comprise a stranded wire made of a plurality of wires and (d) the projected parts are provided on the wall surface so that the intervals P between the projected parts and the height H of the projected parts satisfy the following expressions: P≦4d, 10≦P/H≦20 wherein d represents the diameter of a bubble nucleus.
Claim 2
Dependent Claim
131 words
A heat exchanger tube for evaporation or condensation, said heat exchanger tube comprising: (a) projected parts having cavities in which bubble nuclei form, said projected parts being provided on at least one of the inner wall surface and the outer wall surface of a tubular body, and (b) plain parts formed on the same surface as the projected parts so that the projected parts and the plain parts are interspersed, wherein: (c) the projected parts and the cavities comprise a stranded wire made of a plurality of wires and (d) the projected parts are provided on the wall surface so that the intervals P between the projected parts and the height H of the projected parts satisfy the following expressions: P≦4d, 10≦P/H≦20 wherein d represents the diameter of a bubble nucleus.
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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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |