US2503549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance matching in wave guides
Assignee: AT&T Inc
•
Filing: 1945-08-25
•
Granted: 1950-04-11
•
Expires: 1965-08-25
Abstract
No abstract record available.
Inventors
- 👤 Fox Arthur Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:30
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
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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) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |