US3885622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger tube
Assignee: Olin Corp
•
Filing: 1974-03-04
•
Granted: 1975-05-27
•
Expires: 1994-03-04
Abstract
Abstract Heat exchanger tube wherein the outside and/or inside surfaces of the tube have a heat exchange enhancement pattern formed in them. The heat exchange enhancement pattern does not extend through the full wall thickness. It is possible for the heat exchange enhancement pattern to include longitudinally extending variations in the type of enhancement. A process and apparatus for forming the tube provide for patterning metal strip and then forming the strip into the shape of a tube and then joining the longitudinally extending edges of the strip to form the complete tube.
Inventors
- 👤 Charles D Mclain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:02
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/0803; B21C37/083; F28F1/42; F28F1/424; F28F1/426; F28F13/00; F28F13/14; F28F13/18; F28F13/185; F28F13/187; Y; Y10; Y10S; Y10S165/00; Y10S165/51; Y10S165/515; Y10S29/00; Y10S29/023
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A welded hollow metal heat exchanger tube formed from metal strip material and having a longitudinally extending weld seam, said tube having a given wall thickness and an inside surface corresponding to one side of said strip material and an outside surface corresponding to the opposing side of said strip material, a heat exchange enhancement pattern extending throughout only a portion of the tube wall thickness embossed into at least the inside surface by embossing the corresponding side of said strip, whereby variation in enhancement pattern is provided by varying the embossment of the strip.
Claim 2
Dependent Claim
95 words
A welded hollow metal heat exchanger tube formed from metal strip material and having a longitudinally extending weld seam, said tube having a given wall thickness and an inside surface corresponding to one side of said strip material and an outside surface corresponding to the opposing side of said strip material, a heat exchange enhancement pattern extending throughout only a portion of the tube wall thickness embossed into at least the inside surface by embossing the corresponding side of said strip, whereby variation in enhancement pattern is provided by varying the embossment of the strip.
Claim 3
Dependent Claim
20 words
A tube according to claim 1 wherein said enhancement pattern is on the outside and inside surfaces of the tube.
Claim 4
Dependent Claim
19 words
A tube according to claim 1 wherein said heat exchange enhancement pattern comprises a flat face diamond knurled pattern.
Claim 5
Dependent Claim
18 words
A tube according to claim 1 wherein said heat exchange enhancement pattern comprises a longitudinally extending rib pattern.
Claim 6
Dependent Claim
22 words
A tube according to claim 1 wherein said enhancement pattern includes a longitudinally extending variation in the type or degree of enhancement.
Claim 7
Dependent Claim
51 words
A tube according to claim 5 wherein said longitudinally extending variation in said hehat exchange enhancement pattern comprises a first heat exchange enhancement pattern in a first longitudinally extending portion of a tube surface and a second heat exchange enhancement pattern in a second longitudinally extending portion of a tube surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |