US3353250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing a heat exchanger
Assignee: Hitachi Ltd
•
Filing: 1964-03-24
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Granted: 1967-11-21
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Expires: 1984-03-24
Abstract
No abstract record available.
Inventors
- 👤 Kikuchi Wahei
- 👤 Watanabe Masatoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:09
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/024; B; B21; B21D; B21D53/00; B21D53/02; B21D53/027; F28F; F28F9/00; F28F9/007; F28F9/013; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49362
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A METHOD OF MANUFACTURING A WOUND TUBE HEAT EXCHANGER OF RELATIVELY GREAT WEIGHT AND AXIAL EXTENT ON A RELATIVELY WEAK CORE SELECTED FOR ITS EFFECT ON THE HEAT EXCHANGER INDEPENDENTLY OF ITS SUPPORT CHARACTERISTICS, INCLUDING THE STEPS OF PROVIDING A CORE HAVING OPPOSED ENDS, ROTATING SAID CORE ABOUT AN AXIS THROUGH ITS ENDS, WINDING A CONTINUOUS HEAT EXCHANGE TUBE HELICALLY AROUND SAID CORE IN MULTIPLE LAYERS FROM ONE OPPOSED END TO THE OTHER OPPOSED END OF THE CORE, WHEREIN THE IMPROVEMENT COMPRISES: SUPPORTING THE CORE BETWEEN ITS OPPOSITE ENDS BY A DRIVINGLY CONNECTED SUPPORT RING; SUPPORTING THE SUPPORT RING IN A BEARING FOR ROTATION WITH
Claim 2
Dependent Claim
106 words
IN A METHOD OF MANUFACTURING A WOUND TUBE HEAT EXCHANGER OF RELATIVELY GREAT WEIGHT AND AXIAL EXTENT ON A RELATIVELY WEAK CORE SELECTED FOR ITS EFFECT ON THE HEAT EXCHANGER INDEPENDENTLY OF ITS SUPPORT CHARACTERISTICS, INCLUDING THE STEPS OF PROVIDING A CORE HAVING OPPOSED ENDS, ROTATING SAID CORE ABOUT AN AXIS THROUGH ITS ENDS, WINDING A CONTINUOUS HEAT EXCHANGE TUBE HELICALLY AROUND SAID CORE IN MULTIPLE LAYERS FROM ONE OPPOSED END TO THE OTHER OPPOSED END OF THE CORE, WHEREIN THE IMPROVEMENT COMPRISES: SUPPORTING THE CORE BETWEEN ITS OPPOSITE ENDS BY A DRIVINGLY CONNECTED SUPPORT RING; SUPPORTING THE SUPPORT RING IN A BEARING FOR ROTATION WITH
References Cited (Backward Citations)
US553105A
Cited
US2231295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |