Patent US2976533A successfully refreshed from Google Patents.
US2976533A
Expired / Lapsed
US
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Radio astronomy antenna having spherical reflector formed integral with earth's surface
Assignee: Zenith Electronics LLC
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Filing: 1954-11-12
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Granted: 1961-03-21
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Expires: 1974-11-12
Abstract
No abstract record available.
Inventors
- 👤 Winfield W Salisbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:17
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2419556A
Cited
US2454144A
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US2516453A
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US2607009A
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US2677056A
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US2671853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |