US2499423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone transmission circuits for coupling input and output devices to a telephone line
Assignee: Hartford National Bank and Trust Co
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Filing: 1946-03-06
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Granted: 1950-03-07
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Expires: 1966-03-06
Abstract
No abstract record available.
Inventors
- 👤 Selinger Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:41
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/58; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |