US3348402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making coil for absorption refrigeration apparatus
Assignee: Electrolux AB
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Filing: 1964-03-27
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Granted: 1967-10-24
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Expires: 1984-03-27
Abstract
No abstract record available.
Inventors
- 👤 Reistad Bengt Reistad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:55
CPC Classifications
F; F25; F25B; F25B15/00; F25B15/10; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/28; B21C37/283; B21D; B21D11/00; B21D11/06; B21D11/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A METHOD OF MAKING A COIL FOR A GAS CIRCUIT OF ABSORPTION REFRIGERATION APPARATUS WHICH COMPRISES FIRST DEFORMING A REGION OF A STRAIGHT PIECE OF PIPE WHICH IS CYLINDRICAL IN CROSS-SECTION AND FORMED OF FERROUS METAL TO PROVIDE A PIPE SECTION AT SAID REGION HAVING A MINOR AXIS AND A LONGER MAJOR AXIS AND A LONGITUDINAL REENTRANT PORTION IN THE WALL THEREOF, AND THEREAFTER BENDING THE PIPE BACK UPON ITSELF TO FORM A BEND AT SAID REGION AND STRAIGHT PIPE SECTIONS CONNECTED THERETO WITH THE MAJOR AXIS OF SAID REGION EXTENDING SUBSTANTIALLY IN THE SAME DIRECTION AS THE AXIS OF THE RADIUS OF CURVATURE OF THE BEND AND THE REENTRANT PORTION AT THE INSIDE WALL OF THE BEND AND THE INNER DIAMETER OF EACH STRAIGHT PIPE SECTION BEING SUBSTANTIALLY EQUAL TO THE DISTANCE BETWEEN THE INNER SURFACES OF THE OPPOSING WALLS OF SAID PIPE SECTION AT THE BEND AT THE IMMEDIATE VICINITY OF THE MAJOR AXIS THEREOF, THE LONGITUDINAL REENTRANT PORTION FUNCTIONING TO SUPPORT THE OPPOSITE OUTER SIDE WALL OF THE PIPE AT THE BEND WHILE IT IS BEING FORMED.
Claim 2
Independent Claim
180 words
A METHOD OF MAKING A COIL FOR A GAS CIRCUIT OF ABSORPTION REFRIGERATION APPARATUS WHICH COMPRISES FIRST DEFORMING A REGION OF A STRAIGHT PIECE OF PIPE WHICH IS CYLINDRICAL IN CROSS-SECTION AND FORMED OF FERROUS METAL TO PROVIDE A PIPE SECTION AT SAID REGION HAVING A MINOR AXIS AND A LONGER MAJOR AXIS AND A LONGITUDINAL REENTRANT PORTION IN THE WALL THEREOF, AND THEREAFTER BENDING THE PIPE BACK UPON ITSELF TO FORM A BEND AT SAID REGION AND STRAIGHT PIPE SECTIONS CONNECTED THERETO WITH THE MAJOR AXIS OF SAID REGION EXTENDING SUBSTANTIALLY IN THE SAME DIRECTION AS THE AXIS OF THE RADIUS OF CURVATURE OF THE BEND AND THE REENTRANT PORTION AT THE INSIDE WALL OF THE BEND AND THE INNER DIAMETER OF EACH STRAIGHT PIPE SECTION BEING SUBSTANTIALLY EQUAL TO THE DISTANCE BETWEEN THE INNER SURFACES OF THE OPPOSING WALLS OF SAID PIPE SECTION AT THE BEND AT THE IMMEDIATE VICINITY OF THE MAJOR AXIS THEREOF, THE LONGITUDINAL REENTRANT PORTION FUNCTIONING TO SUPPORT THE OPPOSITE OUTER SIDE WALL OF THE PIPE AT THE BEND WHILE IT IS BEING FORMED.
References Cited (Backward Citations)
US2008343A
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US2748455A
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US2746727A
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US2819731A
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US3020725A
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US3042099A
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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) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |