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Patent US2709575A successfully refreshed from Google Patents.
US2709575A
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Method and apparatus for heat exchange
Assignee: L S MCLEOD
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Filing: 1949-11-18
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Granted: 1955-05-31
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Expires: 1969-11-18
Abstract
No abstract record available.
Inventors
- 👤 Clarence T Soreusen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:29
CPC Classifications
F; F25; F25B; F25B15/00; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US652070A
Cited
US1271268A
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GB241087A
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US1693970A
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US1887580A
Cited
US1918969A
Cited
US2068955A
Cited
US2179734A
Cited
US2236575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |