US2710944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interstage coupling network
Assignee: AT&T Inc
•
Filing: 1953-09-01
•
Granted: 1955-06-14
•
Expires: 1973-09-01
Abstract
No abstract record available.
Inventors
- 👤 John T Bangert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:28
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0138; H03H7/0146; H03H7/17; H03H7/1741; H03H7/1758; H03H7/1775; H03H7/1783
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1788538A
Cited
US2167134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-13 | 1958-12-13 | 1959-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-13 | 1962-12-13 | 1963-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-13 | 1966-12-13 | 1967-06-14 | $7700.00 | Window Closed / Lapsed |