Patent US3368547A successfully refreshed from Google Patents.
US3368547A
Expired / Lapsed
US
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Finned-tube heat exchanger
Assignee: Individual
•
Filing: 1965-10-23
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Granted: 1968-02-13
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 William A Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:25
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/12; F24H1/14; F24H1/145; F28; F28F; F28F1/00; F28F1/10; F28F1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US473176A
Cited
CA604025A
Cited
US672412A
Cited
US1942211A
Cited
US2036961A
Cited
GB403899A
Cited
US2086647A
Cited
US2203718A
Cited
US2205984A
Cited
US3219017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |