Patent FR2647681A1 successfully refreshed from Google Patents.
US2578273A
Expired / Lapsed
US
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Electronic time delay device
Assignee: Individual
•
Filing: 1946-02-27
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Granted: 1951-12-11
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Expires: 1966-02-27
Abstract
No abstract record available.
Inventors
- 👤 George P Wachtell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:38
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/10; H03K4/12; H03K4/16; H03K3/00; H03K3/02; H03K3/04; H03K3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1587520A
Cited
US1950400A
Cited
US2188653A
Cited
US2408076A
Cited
US2417834A
Cited
US2415093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |