US5184674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inner ribbed tube and method
Assignee: Neotiss Inc
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Filing: 1990-12-26
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Granted: 1993-02-09
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Expires: 2010-12-26
Abstract
Abstract A heat exchanger inner spiral ribbed tube and method of manufacture therefor for use in making a refrigerator condenser or a refrigerator evaporator. The tube has an annular wall having an inner surface. The inner surface has a plurality of inner spiral ribs, each having a spiral angle. The spiral angle is between 0 degrees and 90 degrees; and is 45 degrees in the described embodiment. The tube making method includes the steps of swaging a plain plate between a plain roller and a grooved roller to make a ribbed plate; then seam welding the plate at the longitudinal adjacent edges thereof to make the inner spiral ribbed tube.
Inventors
- 👤 John M. Keyes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:46
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/0818; B21C37/15; B21C37/20; B21C37/207
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A seam welded tube for use in making a refrigerator condenser or a refrigerator evaporator comprising: an annular wall having an inner surface and an elongate axis; said inner surface having a series of axially spaced inner spiral rib loops; said inner spiral rib loops each having a spiral angle formed by a tangent to a point on the rib loop and a longitudinal line through the point and parallel to the elongate axis of the tube; said spiral angle having a size in the range between zero degrees and 90 degrees; said tube annular wall having adjacent elongate wall portions extending substantially parallel to the elongate axis, and said elongate wall portions having an elongate seam weld therebetween; and said loops being discontinuous at the seam weld.
Claim 2
Dependent Claim
128 words
A seam welded tube for use in making a refrigerator condenser or a refrigerator evaporator comprising: an annular wall having an inner surface and an elongate axis; said inner surface having a series of axially spaced inner spiral rib loops; said inner spiral rib loops each having a spiral angle formed by a tangent to a point on the rib loop and a longitudinal line through the point and parallel to the elongate axis of the tube; said spiral angle having a size in the range between zero degrees and 90 degrees; said tube annular wall having adjacent elongate wall portions extending substantially parallel to the elongate axis, and said elongate wall portions having an elongate seam weld therebetween; and said loops being discontinuous at the seam weld.
Claim 3
Dependent Claim
14 words
The tube of claim 1, wherein the elongate wall portions are thickened wall portions.
Claim 4
Dependent Claim
21 words
The tube of claim 1, wherein the spiral angle has a size in the range between 35 degrees and 90 degrees.
Claim 5
Dependent Claim
16 words
The tube of claim 3, wherein the spiral angle has a size of about 45 degrees.
References Cited (Backward Citations)
US1928639A
Cited
US2817364A
Cited
US3753364A
Cited
US4044797A
Cited
US4164243A
Cited
US4658892A
Cited
US4658892B1
Cited
SU1252646A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-02-09 | 1996-08-10 | 1997-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-09 | 2000-08-10 | 2001-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-09 | 2004-08-10 | 2005-02-09 | $7700.00 | Window Closed / Lapsed |