US3850227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving heat transfer efficiency and improved heat transfer system
Assignee: Olin Corp
•
Filing: 1972-11-24
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Granted: 1974-11-26
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Expires: 1992-11-24
Abstract
Abstract The instant disclosure teaches a process for improving heat transfer efficiency and an improved heat exchange system utilizing an improved highly corrosion resistant enhanced metal tubing consisting essentially of from 0.5 to 4.0 percent iron, balance essentially copper.
Inventors
- 👤 J Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:55
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/085; C; C22; C22C; C22C9/00; F28F1/00; F28F1/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
An improved heat transfer system having improved heat transfer efficiency and high corrosion resistance including: A. providing an enhanced metal tubing having a wall thickness of from 0.010 inch to 1.0 inch, an enhanced central section, a relatively smooth entrance end and a relatively smooth exit end, said metal tubing consisting essentially of from 0.5 to 4.0 percent iron, balance essentially copper, said enhanced central section having an irregular surface with a series of protrusions therein; B. a first entrance tube sheet affixed to the entrance end of the enhanced tubing; C. a second exit tube sheet affixed to the exit end of the enhanced tubing; D. a first fluid passing through the enhanced tubing; and E. a second fluid in contact with the external walls of the enhanced tubing in heat exchange relationship with the first fluid.
Claim 2
Dependent Claim
138 words
An improved heat transfer system having improved heat transfer efficiency and high corrosion resistance including: A. providing an enhanced metal tubing having a wall thickness of from 0.010 inch to 1.0 inch, an enhanced central section, a relatively smooth entrance end and a relatively smooth exit end, said metal tubing consisting essentially of from 0.5 to 4.0 percent iron, balance essentially copper, said enhanced central section having an irregular surface with a series of protrusions therein; B. a first entrance tube sheet affixed to the entrance end of the enhanced tubing; C. a second exit tube sheet affixed to the exit end of the enhanced tubing; D. a first fluid passing through the enhanced tubing; and E. a second fluid in contact with the external walls of the enhanced tubing in heat exchange relationship with the first fluid.
Claim 3
Dependent Claim
13 words
A heat transfer system according to claim 1 wherein said tubing is corrugated.
Claim 4
Dependent Claim
13 words
A heat transfer system according to claim 1 wherein said tubing is knurled.
Claim 5
Dependent Claim
21 words
A heat transfer system according to claim 1 wherein said tubing contains phosphorus in an amount from 0.015 to 0.04 percent.
Claim 6
Dependent Claim
20 words
A heat transfer system according to claim 4 wherein said tubing includes zinc in an amount up to 0.30 percent.
Claim 7
Dependent Claim
14 words
A heat transfer system according to claim 1 wherein said tubing is welded tubing.
References Cited (Backward Citations)
US3154141A
Cited
US3530923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |