US2740094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave-guide impedance elements
Assignee: AT&T Inc
•
Filing: 1952-01-12
•
Granted: 1956-03-27
•
Expires: 1972-01-12
Abstract
No abstract record available.
Inventors
- 👤 Arthur G Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:40
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2138; H01P1/207; H01P1/209; H01P5/00; H01P5/02; H01P5/022; H01P5/024; H01P5/08; H01Q; H01Q13/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |