US3605872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of causing a liquid to flow in a stream of annular cross section
Assignee: WIEGAND APPARATEBAU GmbH
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Filing: 1969-08-11
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Granted: 1971-09-20
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Expires: 1989-08-11
Abstract
Abstract When a liquid and a gas are passed continuously through a helical heat exchanger conduit spiraling about a vertically extending axis, the liquid is forced against the wall of the conduit and the gas occupies the center of the tube if the flow rates of the liquid and gas are controlled to permit the liquid to be discharged from the conduit over the entire circumference of the exit orifice of the conduit. High heat transfer coefficients are obtained thereby between the liquid and the conduit wall.
Inventors
- 👤 Jacques Brault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:27
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F28D; F28D7/00; F28D7/02; F28D7/024; F28D7/10; F28D7/106; Y; Y10; Y10S; Y10S159/00; Y10S159/15; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |