Patent US833358A successfully refreshed from Google Patents.
Patent US3206838A successfully refreshed from Google Patents.
US3206838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger element
Assignee: Olin Corp
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Filing: 1955-12-29
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Granted: 1965-09-21
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Expires: 1975-12-29
Abstract
No abstract record available.
Inventors
- 👤 Theron F Pauls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:26
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045; F28F3/00; F28F3/02; F28F3/025; F28F3/027; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49369; Y10T29/49371
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF MAKING SEAMLESS, FINNED TUBING COMPRISING PROVIDING A SUPERPOSED PAIR OF COMPONENT SHEETS HAVING WELD-PREVENTING MATERIAL BETWEEN THEM EXCEPT AT LATERALLY SPACED PORTIONS, REDUCING THE THICKNESS OF THE SUPERPOSED ASSEMBLY OF SAID SHEETS AT SPACED INTERVALS MORE SEVERELY THAN BETWEEN SAID SPACED INTERVALS THEREBY SIMULTANEOUSLY WELDING SAID SHEETS AT SAID LATERALLY SPACED PORTIONS AND FORMING EXTERNAL FINS INTERMEDIATE SAID INTERVALS AND INTERMEDIATE SAID LATERALLY SPACED PORTIONS, AND THEREAFTER SEPARATING SAID SHEETS INTERMEDIATE SAID LATERL PORTIONS TO FINAL TUBE FORM HAVING AT LEAST ONE LONGITUDINALLY EXTENDING PASSAGEWAY IN THE TUBING.
Claim 2
Independent Claim
91 words
THE METHOD OF MAKING SEAMLESS, FINNED TUBING COMPRISING PROVIDING A SUPERPOSED PAIR OF COMPONENT SHEETS HAVING WELD-PREVENTING MATERIAL BETWEEN THEM EXCEPT AT LATERALLY SPACED PORTIONS, REDUCING THE THICKNESS OF THE SUPERPOSED ASSEMBLY OF SAID SHEETS AT SPACED INTERVALS MORE SEVERELY THAN BETWEEN SAID SPACED INTERVALS THEREBY SIMULTANEOUSLY WELDING SAID SHEETS AT SAID LATERALLY SPACED PORTIONS AND FORMING EXTERNAL FINS INTERMEDIATE SAID INTERVALS AND INTERMEDIATE SAID LATERALLY SPACED PORTIONS, AND THEREAFTER SEPARATING SAID SHEETS INTERMEDIATE SAID LATERL PORTIONS TO FINAL TUBE FORM HAVING AT LEAST ONE LONGITUDINALLY EXTENDING PASSAGEWAY IN THE TUBING.
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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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |