US2761915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helix couplers
Assignee: AT&T Inc
•
Filing: 1952-02-08
•
Granted: 1956-09-04
•
Expires: 1972-02-08
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:45
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/36; H01J23/40; H01J23/42; H01P; H01P5/00; H01P5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2408032A
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US2602148A
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US2526846A
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US2572672A
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US2578434A
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US2637775A
Cited
US2603772A
Cited
US2611102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |