US3221135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of welding fin tube panel
Assignee: Foster Wheeler Inc
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Filing: 1963-12-24
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Granted: 1965-11-30
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Expires: 1983-12-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Leo A Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:46
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/101; F22B37/102; B; B23; B23K; B23K9/00; B23K9/0026; B23K9/0052; B23K9/02; B23K9/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A SINGLE-PASS METHOD OF FORMING A FIN BETWEEN TWO PARALLEL, SPACED, THIN-WALLED TUBES, COMPRISING: PLACING A LAYER OF GRANULAR BACKING IN THE LOWER AREA BETWEEN TWO PARALLEL, SPACED, THIN-WALLED TUBES, SAID GRANULAR BACKING HAVING A HIGH MELTING TEMPERATURE AND BEING THERMALLY AND ELECTRICALLY INSULATING, PLACING A LAYER OF GRANULAR ALLOYING MATERIAL OVER SAID GRANULAR BACKING LAYER IN THE INTERMEDIATE AREA BETWEEN THE TWO TUBES, APPLYING A WELDING HEAT TO THE LAYER OF GRANULAR ALLOYING MATERIAL, SAID WELDING HEAT HAVING SUFFICIENT INTENSITY TO MELT SAID GRANULAR ALLOYING MATERIAL,
Claim 2
Dependent Claim
87 words
A SINGLE-PASS METHOD OF FORMING A FIN BETWEEN TWO PARALLEL, SPACED, THIN-WALLED TUBES, COMPRISING: PLACING A LAYER OF GRANULAR BACKING IN THE LOWER AREA BETWEEN TWO PARALLEL, SPACED, THIN-WALLED TUBES, SAID GRANULAR BACKING HAVING A HIGH MELTING TEMPERATURE AND BEING THERMALLY AND ELECTRICALLY INSULATING, PLACING A LAYER OF GRANULAR ALLOYING MATERIAL OVER SAID GRANULAR BACKING LAYER IN THE INTERMEDIATE AREA BETWEEN THE TWO TUBES, APPLYING A WELDING HEAT TO THE LAYER OF GRANULAR ALLOYING MATERIAL, SAID WELDING HEAT HAVING SUFFICIENT INTENSITY TO MELT SAID GRANULAR ALLOYING MATERIAL,
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |