Patent US1858484A successfully refreshed from Google Patents.
Patent US2540179A successfully refreshed from Google Patents.
US2540179A
Expired / Lapsed
US
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Signal indicating system
Assignee: RCA Corp
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Filing: 1947-12-30
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Granted: 1951-02-06
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Expires: 1967-12-30
Abstract
No abstract record available.
Inventors
- 👤 Frank J Somers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:15
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/30; H; H04; H04N; H04N17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2122499A
Cited
US2178074A
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US2089430A
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US2293135A
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US2432196A
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US2284219A
Cited
US2439050A
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US2448363A
Cited
US2439321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |