US2490833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
All electronic line finder and selector system
Assignee: Federal Telecommunication Laboratories Inc
•
Filing: 1947-04-26
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Granted: 1949-12-13
•
Expires: 1967-04-26
Abstract
No abstract record available.
Inventors
- 👤 Ransom David Hiram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:45
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/526
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2387018A
Cited
US2379715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |