US1559642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling with phase reversals
Assignee: AT&T Inc
•
Filing: 1923-08-28
•
Granted: 1925-11-03
•
Expires: 1943-08-28
Abstract
No abstract record available.
Inventors
- 👤 Nyquist Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:38
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/233; H04L27/2334; H04L27/20; H04L27/2032; H04L27/2035
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) | 1928-11-02 | 1929-05-04 | 1929-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-11-02 | 1933-05-04 | 1933-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-11-02 | 1937-05-04 | 1937-11-03 | $7700.00 | Window Closed / Lapsed |