Patent US2457202A successfully refreshed from Google Patents.
US2397604A
Expired / Lapsed
US
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Electrical indication at a distance
Assignee: STC PLC
•
Filing: 1943-06-17
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Granted: 1946-04-02
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Expires: 1963-06-17
Abstract
No abstract record available.
Inventors
- 👤 Hartley George Clifford
- 👤 Mcwhirter Eric Malcolm Swift
- 👤 Handley John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:59
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/16; G08C19/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-04-01 | 1949-10-01 | 1950-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-04-01 | 1953-10-01 | 1954-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-04-01 | 1957-10-01 | 1958-04-02 | $7700.00 | Window Closed / Lapsed |