US3232344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers, pre-heaters, economizers and the like
Assignee: Individual
•
Filing: 1963-07-19
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Granted: 1966-02-01
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Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 Andersson Erik Sven Alvar
- 👤 Jonsson Uno Sven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:18
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/122; F28F13/00; F28F13/003; F28F13/06; F28F13/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
AN APPARATUS FOR FACILITATING HEAT EXCHANGE BETWEEN TWO FLUIDS, COMPRISING: (A) AN ELONGATED FIRST TUBE ADAPTED TO CARRY A FIRST FLUID AXIALLY THERETHROUGH; (B) AND ELONGATED SECOND TUBE, LARGER THAN SAID FIRST TUBE AND MOUNTED TO SURROUND SAID FIRST TUBE AND FORM AND ANNULAR SPACE BETWEEN SAID FIRST AND SECOND TUBES; AND (C) AT LEAST ONE PIPE HELICALLY DISPOSED WITHIN AND ESSENTIALLY FILLING SAID ANNULAR SPACE; (D) SAID HELICAL PIPE BEING IN INITIMATE HEAT EXCHANGE CONTACT WITH THE EXTERIOR WALL OF SAID FIRST TUBE; AND (E) SAID HELICAL PIPE HAVING FORMED THEREIN A PLURALITY OF SUBSTANTIALLY OPPOSED PERFORATIONS AT SPACED INTERVALS ALONG ITS LENGTHS, WHEREBY SAID HELICAL PIPE IS ADAPTED TO CARRY A SECOND FLUID ALONG A HELICAL PATH THROUGH SAID HELICAL PIPE AND ALONG A SECOND PATH, THROUGH SAID PERFORATIONS, ESSENTIALLY PARALLEL TO THE AXES OF SAID FIRST AND SECOND TUBES.
Claim 2
Independent Claim
142 words
AN APPARATUS FOR FACILITATING HEAT EXCHANGE BETWEEN TWO FLUIDS, COMPRISING: (A) AN ELONGATED FIRST TUBE ADAPTED TO CARRY A FIRST FLUID AXIALLY THERETHROUGH; (B) AND ELONGATED SECOND TUBE, LARGER THAN SAID FIRST TUBE AND MOUNTED TO SURROUND SAID FIRST TUBE AND FORM AND ANNULAR SPACE BETWEEN SAID FIRST AND SECOND TUBES; AND (C) AT LEAST ONE PIPE HELICALLY DISPOSED WITHIN AND ESSENTIALLY FILLING SAID ANNULAR SPACE; (D) SAID HELICAL PIPE BEING IN INITIMATE HEAT EXCHANGE CONTACT WITH THE EXTERIOR WALL OF SAID FIRST TUBE; AND (E) SAID HELICAL PIPE HAVING FORMED THEREIN A PLURALITY OF SUBSTANTIALLY OPPOSED PERFORATIONS AT SPACED INTERVALS ALONG ITS LENGTHS, WHEREBY SAID HELICAL PIPE IS ADAPTED TO CARRY A SECOND FLUID ALONG A HELICAL PATH THROUGH SAID HELICAL PIPE AND ALONG A SECOND PATH, THROUGH SAID PERFORATIONS, ESSENTIALLY PARALLEL TO THE AXES OF SAID FIRST AND SECOND TUBES.
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) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |