Patent US2923476A successfully refreshed from Google Patents.
US2923476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal comparison system
Assignee: AT&T Inc
•
Filing: 1957-04-10
•
Granted: 1960-02-02
•
Expires: 1977-04-10
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Ketchledge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:53
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/02; G06F7/026
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2763432A
Cited
US2318591A
Cited
US2364540A
Cited
FR1005754A
Cited
US2540442A
Cited
US2749440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |