Patent US2840700A successfully refreshed from Google Patents.
US2840700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode very low frequency radio receiving antenna for submarines
Assignee: Individual
•
Filing: 1954-06-30
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Granted: 1958-06-24
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Expires: 1974-06-30
Abstract
No abstract record available.
Inventors
- 👤 Jewel D Browder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:40
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1387736A
Cited
US1303729A
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US1708071A
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US1471165A
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US2002181A
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US2139533A
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US2230461A
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US2313046A
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US2664507A
Cited
US2660709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |