US2254601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic measuring of cross talk
Assignee: AT&T Inc
•
Filing: 1940-04-03
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Granted: 1941-09-02
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Expires: 1960-04-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Edwin P Felch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:28
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/20; H03J7/22; H04; H04B; H04B3/00; H04B3/02; H04B3/46; H04B3/487; H04J; H04J1/00; H04J1/02; H04J1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-09-01 | 1945-03-03 | 1945-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-01 | 1949-03-03 | 1949-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-01 | 1953-03-03 | 1953-09-02 | $7700.00 | Window Closed / Lapsed |