US2939092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling arrangements
Assignee: AT&T Inc
•
Filing: 1954-10-29
•
Granted: 1960-05-31
•
Expires: 1974-10-29
Abstract
No abstract record available.
Inventors
- 👤 John S Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:27
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18; H01P5/181; H01P5/182; H01J; H01J23/00; H01J23/36; H01J23/40; H01J23/48; H01J23/52
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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |