US4796693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned tube with indented groove base and method of forming same
Assignee: Wieland Werke AG
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Filing: 1986-10-21
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Granted: 1989-01-10
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Expires: 2006-10-21
Abstract
Abstract A tube for heat transfer systems or the like is provided which includes helically or circumferentially disposed, radially extending ribs or fins. The base of the grooves defined between adjacent fins has a plurality of discrete impressions defined therein. The provision of discrete impressions in the groove base improves the heat transfer characteristics of the tube by greatly increasing the outer surface area of the tube relative to the inner surface area of the tube.
Inventors
- 👤 Hans-Werner Kastner
- 👤 Robert Klockler
- 👤 Manfred Hage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:52
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21C37/207; B21D; B21D15/00; B21D15/04; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
84 words
A tube for heat transfer systems having radially extending fins disposed on the outer surface thereof, grooves disposed between adjacent fins, said grooves having a base, a plurality of spaced indents formed in the base of said grooves, said tube having a smooth interior surface; said indents having a first dimension extending substantially in the direction of the length of said grooves and a second dimension substantially transverse to said first dimension, said first dimension being less than or equal to said second dimension.
Claim 2
Dependent Claim
84 words
A tube for heat transfer systems having radially extending fins disposed on the outer surface thereof, grooves disposed between adjacent fins, said grooves having a base, a plurality of spaced indents formed in the base of said grooves, said tube having a smooth interior surface; said indents having a first dimension extending substantially in the direction of the length of said grooves and a second dimension substantially transverse to said first dimension, said first dimension being less than or equal to said second dimension.
Claim 3
Dependent Claim
21 words
A tube as in claim 1, wherein said fins and said grooves are disposed in a helical array along said tube.
Claim 4
Dependent Claim
22 words
A tube as in claim 1, wherein said fins and said grooves are disposed as rings along the length of said tube.
Claim 5
Dependent Claim
16 words
A tube as in claim 2, wherein said second dimension is smaller than the fin pitch.
Claim 6
Dependent Claim
90 words
A tube for heat transfer systems having radialy extending fins disposed on the outer surface thereof, grooves disposed between adjacent fins, said grooves having a base, a plurality of spaced indents formed in the base of said grooves, and having projections corresponding to said grooves disposed on the interior surface thereof; said indents having a first dimension extending substantially in the direction of the length of said grooves and a second dimension substantially transverse to said first dimension, said first dimension being less than or equal to said second dimension.
Claim 7
Dependent Claim
90 words
A tube for heat transfer systems having radialy extending fins disposed on the outer surface thereof, grooves disposed between adjacent fins, said grooves having a base, a plurality of spaced indents formed in the base of said grooves, and having projections corresponding to said grooves disposed on the interior surface thereof; said indents having a first dimension extending substantially in the direction of the length of said grooves and a second dimension substantially transverse to said first dimension, said first dimension being less than or equal to said second dimension.
Claim 8
Dependent Claim
32 words
A tube as in claim 1, wherein said second dimension is disposed at an angle α relative to a plane of said groove, wherein α is between about 0° and about 180°.
Claim 9
Dependent Claim
14 words
A tube as in claim 6, wherein α is between about 10° and 170°.
Claim 10
Dependent Claim
10 words
A tube as in claim 7, wherein α equals 90°.
Claim 11
Dependent Claim
44 words
A tube for heat transfer systems having fins disposed on the outer surface thereof, grooves disposed between adjacent fins, said grooves having a base, a plurality of spaced indents defined in the base of said grooves said tube having a substantially smooth inner surface.
Claim 12
Dependent Claim
44 words
A tube for heat transfer systems having fins disposed on the outer surface thereof, grooves disposed between adjacent fins, said grooves having a base, a plurality of spaced indents defined in the base of said grooves said tube having a substantially smooth inner surface.
Claim 13
Dependent Claim
25 words
A tube as in claim 9, wherein said fins and said grooves are disposed in the helical array on the exterior surface of said tube.
Claim 14
Dependent Claim
23 words
A tube as in claim 9, wherein said fins and said grooves are disposed as rings on the outer surface of the tube.
Claim 15
Dependent Claim
19 words
A tube as in claim 1 or 9, wherein each said indent extends the total width of said groove.
Claim 16
Dependent Claim
19 words
A tube as in claim 1 or 9, wherein said indents are disposed at regular intervals along said grooves.
Claim 17
Dependent Claim
21 words
A tube as in claim 1 or 9, wherein about 0.5 to 20 indents are defined per centimeter of groove length.
Claim 18
Dependent Claim
19 words
A tube as in claim 14, wherein about 4 to 13 indents are defined per centimeter of groove length.
Claim 19
Dependent Claim
20 words
A tube as in claim 15, wherein there are approximately 7 to 11 indents disposed per centimeter of groove length.
Claim 20
Dependent Claim
21 words
A tube as in claim 1 or 9, wherein the depth of each said indent is about 0.01 to 1.0 millimeters.
Claim 21
Dependent Claim
18 words
A tube as in claim 17, wherein the depth of said indents is between 0.05 and 0.5 millimeters.
Claim 22
Dependent Claim
17 words
A tube as in claim 1 or 9, wherein said fins have a substantially T-shaped cross section.
Claim 23
Dependent Claim
21 words
A tube as in claim 5, wherein said fins and said grooves are disposed in a helical array along said tube.
Claim 24
Dependent Claim
22 words
A tube as in claim 5, wherein said fins and said grooves are disposed as rings along the length of said tube.
Claim 25
Dependent Claim
16 words
A tube as in claim 20, wherein said second dimension is smaller than the fin pitch.
Claim 26
Dependent Claim
32 words
A tube as in claim 5, wherein said second dimension is disposed at an angle α relative to a plane of said groove, wherein α is between about 0° and about 180°.
Claim 27
Dependent Claim
14 words
A tube as in claim 23, wherein α is between about 10° and 170°.
Claim 28
Dependent Claim
10 words
A tube as in claim 24, wherein α equals 90°.
Claim 29
Dependent Claim
17 words
A tube as in claim 5, wherein each said indent extends the total width of said groove.
Claim 30
Dependent Claim
17 words
A tube as in claim 5, wherein said indents are disposed at regular intervals along said grooves.
Claim 31
Dependent Claim
19 words
a tube as in claim 5, wheein about 0.5 to 20 indents are defined per centimeter of groove length.
Claim 32
Dependent Claim
19 words
A tube as in claim 5, wherein the depth of each said indent is about 0.0 to 1.0 millimeters.
Claim 33
Dependent Claim
15 words
A tube as in claim 5, wherein said fins have a substantially T-shaped cross section.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |