Patent US2520138A successfully refreshed from Google Patents.
US2520138A
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US
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Panoramic receiving system
Assignee: STC PLC
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Filing: 1945-06-07
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Granted: 1950-08-29
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Expires: 1965-06-07
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Frink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:07
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2031639A
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US2279151A
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US2300189A
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US2378604A
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US2465500A
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US2367907A
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US2416346A
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US2347977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |