Patent US2858475A successfully refreshed from Google Patents.
US2858475A
Expired / Lapsed
US
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Method and apparatus for visually analyzing a plurality of signals
Assignee: California Research LLC
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Filing: 1954-02-02
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Granted: 1958-10-28
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Expires: 1974-02-02
Abstract
No abstract record available.
Inventors
- 👤 Francis G Blake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:14
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/28; G01V; G01V1/00; G01V1/28; G01V1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |