Patent US2950423A successfully refreshed from Google Patents.
US2950423A
Expired / Lapsed
US
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Electric relay control circuits
Assignee: Daystrom Inc
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Filing: 1956-12-04
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Granted: 1960-08-23
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Expires: 1976-12-04
Abstract
No abstract record available.
Inventors
- 👤 Lovegrove Henry Joseph
- 👤 Wood Hadley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:47
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/02; H01H47/14
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) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |