US2807757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic relay control
Assignee: Individual
•
Filing: 1953-02-02
•
Granted: 1957-09-24
•
Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Robert W Callinan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:01
CPC Classifications
F; F42; F42C; F42C13/00; F42C13/04; G; G08; G08C; G08C17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2655595A
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US2094351A
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US2247246A
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US2356364A
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US2403615A
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US2479548A
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US2496975A
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US2531416A
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US2536527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |