Patent US2439589A successfully refreshed from Google Patents.
US2439589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Socket connection for radio tubes
Assignee: Individual
•
Filing: 1943-09-14
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Granted: 1948-04-13
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Expires: 1963-09-14
Abstract
No abstract record available.
Inventors
- 👤 Carl H Sundell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:48
CPC Classifications
H; H01; H01R; H01R33/00; H01R33/74; H01R33/76; H01R33/7664
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US671338A
Cited
GB190020311A
Cited
US768175A
Cited
FR32616E
Cited
US1792973A
Cited
CH152371A
Cited
US2200332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |