Patent US5237470A successfully refreshed from Google Patents.
Patent US2477839A successfully refreshed from Google Patents.
US2477839A
Expired / Lapsed
US
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Laminated heat-exchange fin
Assignee: Chase Brass and Copper Co Inc
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Filing: 1944-07-18
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Granted: 1949-08-02
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Expires: 1964-07-18
Abstract
No abstract record available.
Inventors
- 👤 Raimund G Vanderweil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:33
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US837090A
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US1203688A
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US1659920A
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GB291685A
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US1829387A
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US1902349A
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US2134529A
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US2254558A
Cited
US2271131A
Cited
US2368403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-01 | 1953-01-31 | 1953-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-01 | 1957-01-31 | 1957-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-01 | 1961-01-31 | 1961-08-02 | $7700.00 | Window Closed / Lapsed |