US2957944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance-matching network
Assignee: AT&T Inc
•
Filing: 1958-05-22
•
Granted: 1960-10-25
•
Expires: 1978-05-22
Abstract
No abstract record available.
Inventors
- 👤 Monte Robert W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:10
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H04; H04B; H04B3/00; H04B3/02; H04B3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2629819A
Cited
US2874220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |