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Patent US2801294A successfully refreshed from Google Patents.
US2801294A
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Electrodynamic receiving apparatus
Assignee: Holmberg & Co KG
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Filing: 1951-11-13
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Granted: 1957-07-30
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Expires: 1971-11-13
Abstract
No abstract record available.
Inventors
- 👤 Wurdel Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:12
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025; H04R1/00; H04R1/20; H04R1/22; H04R1/225; H04R9/04; H04R9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2162270A
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US2083537A
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US2144184A
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GB491263A
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US2217177A
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US2201059A
Cited
US2275880A
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US2400662A
Cited
US2537253A
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US2638510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |