US2463997A
Expired / Lapsed
US
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Method of making integral external and internal finned tubing
Assignee: CALUMET AND HECLA CONS COPPER
•
Filing: 1944-06-19
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Granted: 1949-03-08
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Expires: 1964-06-19
Abstract
No abstract record available.
Inventors
- 👤 James S Rodgers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:20
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/42; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21C37/207; F28F1/422; Y; Y10; Y10S; Y10S29/00; Y10S29/047; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49382; Y10T29/49384
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE531503C
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US1816159A
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US1909207A
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US1902779A
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US1983466A
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US2281206A
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US2281207A
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US2244800A
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US2322341A
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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) | 1952-03-07 | 1952-09-06 | 1953-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-07 | 1956-09-06 | 1957-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-07 | 1960-09-06 | 1961-03-08 | $7700.00 | Window Closed / Lapsed |