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US3612175A
Expired / Lapsed
US
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Corrugated metal tubing
Assignee: Olin Corp
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Filing: 1969-07-01
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Granted: 1971-10-12
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Expires: 1989-07-01
Abstract
Abstract The instant disclosure teaches an improved corrugated metal tubing having an improved heat-transfer coefficient and having a plurality of lands and grooves extending along the circumference thereof. The grooves comprise at least two independent, continuous grooves extending helically along the circumference of the tube, with each groove being in spaced relationship to each other. Improved heat transfer is obtained by providing that the land width, the groove width and the angle of advance of the helically extending grooves are related in a particular defined manner.
Inventors
- 👤 James A Ford
- 👤 Wade Wolfe Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:58
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; F28F1/42; Y; Y10; Y10S; Y10S165/00; Y10S165/532; Y10S165/535
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
Improved metal tubing having improved heat-transfer characteristics comprising: a hollow corrugated metal tube having a plurality of lands and grooves extending along the circumference thereof, wherein there is relatively larger groove widths in relation to relatively smaller land widths, said grooves comprising at least two independent, continuous grooves extending helically along the circumference of the tube with each groove being in spaced relationship to each other, said tubing exhibiting substantially no change in weight per unit length, with said tubing satisfying the following formula: (L.W./G.W.)+( theta X 0.03) From 0.5 to 2.25 wherein L.W. land width, G.W. groove width, and theta angle of advance of the helically extending grooves.
Claim 2
Dependent Claim
109 words
Improved metal tubing having improved heat-transfer characteristics comprising: a hollow corrugated metal tube having a plurality of lands and grooves extending along the circumference thereof, wherein there is relatively larger groove widths in relation to relatively smaller land widths, said grooves comprising at least two independent, continuous grooves extending helically along the circumference of the tube with each groove being in spaced relationship to each other, said tubing exhibiting substantially no change in weight per unit length, with said tubing satisfying the following formula: (L.W./G.W.)+( theta X 0.03) From 0.5 to 2.25 wherein L.W. land width, G.W. groove width, and theta angle of advance of the helically extending grooves.
Claim 3
Dependent Claim
11 words
Tubing according to claim 1 made of a copper base alloy.
Claim 4
Dependent Claim
16 words
Improved tubing according to claim 1 having a wall thickness of from 0.010 to 0.50 inch.
Claim 5
Dependent Claim
16 words
Improved tubing according to claim 1 having an outside diameter of from 0.25 to 10.5 inches.
Claim 6
Dependent Claim
25 words
Improved tubing according to claim 1 wherein the pressure drop is from 0.6 to 4.5 feet of water at 6 feet per second of water.
Claim 7
Dependent Claim
11 words
Improved tubing according to claim 1 having three independent, continuous grooves.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |