US2853677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-responsive relay and indicator
Assignee: J B T Instruments Inc
•
Filing: 1956-06-29
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Granted: 1958-09-23
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Expires: 1976-06-29
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Daschke
- 👤 William G Snell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:18
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/30; H01H51/32; G; G01; G01R; G01R23/00; G01R23/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US831180A
Cited
US2062915A
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US2163195A
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US2356229A
Cited
US2444398A
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US2714859A
Cited
US2681588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |