US2765430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time delay switching apparatus
Assignee: AT&T Inc
•
Filing: 1953-07-06
•
Granted: 1956-10-02
•
Expires: 1973-07-06
Abstract
No abstract record available.
Inventors
- 👤 Robert P Graef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:20
CPC Classifications
H; H01; H01H; H01H43/00; H01H43/30; H01H43/301; H01H43/302; H01H43/304
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2571360A
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US2596152A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |