US2774945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for transmitting circular electric waves in wave guides
Assignee: AT&T Inc
•
Filing: 1951-11-10
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Granted: 1956-12-18
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Expires: 1971-11-10
Abstract
No abstract record available.
Inventors
- 👤 Stewart E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:14
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2129712A
Cited
US2180950A
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US2395560A
Cited
US2632804A
Cited
US2706278A
Cited
US2656513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |