Patent US2633492A successfully refreshed from Google Patents.
US2633492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guided wave frequency range, frequency selective and equalizing structure
Assignee: AT&T Inc
•
Filing: 1948-12-30
•
Granted: 1953-03-31
•
Expires: 1968-12-30
Abstract
No abstract record available.
Inventors
- 👤 Douglas H Ring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:32
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/209
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2212240A
Cited
US2134278A
Cited
US2275486A
Cited
US2228815A
Cited
US2344813A
Cited
US2445895A
Cited
US2445896A
Cited
US2498548A
Cited
US2564030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |