US2966643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic wave guide structure
Assignee: AT&T Inc
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Filing: 1957-08-23
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Granted: 1960-12-27
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Expires: 1977-08-23
Abstract
No abstract record available.
Inventors
- 👤 Girard T Kohman
- 👤 Stewart E Miller
- 👤 Charles F P Rose
- 👤 Jr James A Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:26
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/12; H01P3/13
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) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |