US2939933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-delay relay
Assignee: Individual
•
Filing: 1957-12-11
•
Granted: 1960-06-07
•
Expires: 1977-12-11
Abstract
No abstract record available.
Inventors
- 👤 George F Manganaro
- 👤 Robert H Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:08
CPC Classifications
H; H01; H01H; H01H61/00; H01H61/02; H01H43/00; H01H43/30; H01H43/301; H01H43/302; H01H43/303
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191320085A
Cited
GB191221540A
Cited
US1297945A
Cited
US2169989A
Cited
US2255672A
Cited
US2388564A
Cited
US2664483A
Cited
US2700084A
Cited
US2809253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |