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US3208261A
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Method of forming reverse bends in extruded integral dual-passage heat exchange tubing
Assignee: Peerless of America Inc
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Filing: 1961-12-11
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Granted: 1965-09-28
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Expires: 1981-12-11
Abstract
No abstract record available.
Inventors
- 👤 Stephen F Pasternak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:20
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/0008; B; B21; B21D; B21D11/00; B21D11/06; B21D11/07; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/53; Y10T29/53113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
THE METHOD OF CREATING AN ARCUATE BEND IN A STRAIGHT LENGTH OF DUAL-PASSAGE HEAT EXCHANGE TUBING HAVING TWO SEPARATE INTERNAL PARALLEL FLUID PASSAGES EXTENDING COEXTENSIVELY THEREALONG AND SEPARATED BY A THICKNESS OF THE MATERIAL FROM WHICH THE TUBING IS FORMED, SAID METHOD COMPRISING THE STEPS OF CUTTING THROUGH THE MATERIAL OF THE TUBING BETWEEN SAID FLUID PASSAGES IN THE REGION OF THE TUBING WHERE THE BEND IS TO BE EFFECTED IN ORDER THUS PHYSICALLY TO DISSOCIATE THE BODIES OF MATERIAL SURROUNDING THE TWO PASSAGES RESPECTIVELY, AND HEREAFTER APPLYING BENDING FORCE TO THE STRAIGHT SECTIONS OIF THE TUBING ONN OPPOSITE SIDES OF SAID REGION AND CAUSING SAID SECTIONS TO BE SWUNG ANGULARLY TOWARD EACH OTHER WHILE MAINTAINING THE PASSAGES THROUGH SAID SECTIONS IN SUBSTANNTIALLY COPLANAR RELATIONSHIP, SUCH APPLICATION OF BENDING FORCE TO THE STRAIGHT SECTIONS OF THE TUBING SERVING TO EFFECT A SLIDING MOVEMENT OF ONE OF SAID BODIES OF MATERIAL IN THE BENDING
Claim 2
Independent Claim
153 words
THE METHOD OF CREATING AN ARCUATE BEND IN A STRAIGHT LENGTH OF DUAL-PASSAGE HEAT EXCHANGE TUBING HAVING TWO SEPARATE INTERNAL PARALLEL FLUID PASSAGES EXTENDING COEXTENSIVELY THEREALONG AND SEPARATED BY A THICKNESS OF THE MATERIAL FROM WHICH THE TUBING IS FORMED, SAID METHOD COMPRISING THE STEPS OF CUTTING THROUGH THE MATERIAL OF THE TUBING BETWEEN SAID FLUID PASSAGES IN THE REGION OF THE TUBING WHERE THE BEND IS TO BE EFFECTED IN ORDER THUS PHYSICALLY TO DISSOCIATE THE BODIES OF MATERIAL SURROUNDING THE TWO PASSAGES RESPECTIVELY, AND HEREAFTER APPLYING BENDING FORCE TO THE STRAIGHT SECTIONS OIF THE TUBING ONN OPPOSITE SIDES OF SAID REGION AND CAUSING SAID SECTIONS TO BE SWUNG ANGULARLY TOWARD EACH OTHER WHILE MAINTAINING THE PASSAGES THROUGH SAID SECTIONS IN SUBSTANNTIALLY COPLANAR RELATIONSHIP, SUCH APPLICATION OF BENDING FORCE TO THE STRAIGHT SECTIONS OF THE TUBING SERVING TO EFFECT A SLIDING MOVEMENT OF ONE OF SAID BODIES OF MATERIAL IN THE BENDING
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |