US2643172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information collecting system
Assignee: —
•
Filing: —
•
Granted: 1953-06-23
•
Expires: 1970-06-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:11
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/02; H04L12/12; H03; H03M; H03M1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1786805A
Cited
US1945666A
Cited
US2401729A
Cited
US2427670A
Cited
US2488508A
Cited
US2465976A
Cited
US2466804A
Cited
US2477973A
Cited
US2522453A
Cited
US2502654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |