US2963661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave guide filter
Assignee: AT&T Inc
•
Filing: 1956-05-09
•
Granted: 1960-12-06
•
Expires: 1976-05-09
Abstract
No abstract record available.
Inventors
- 👤 Seidel Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:27
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2602893A
Cited
US2423396A
Cited
US2870418A
Cited
US2784378A
Cited
US2879484A
Cited
US2866949A
Cited
US2825765A
Cited
US2849689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |