US3054859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangements for providing two-way communication at intermediate points on a telephone circuit
Assignee: Telephone Manufacturing Co Ltd
•
Filing: 1958-04-11
•
Granted: 1962-09-18
•
Expires: 1978-04-11
Abstract
No abstract record available.
Inventors
- 👤 Brown Derrick Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:02
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1406678A
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US1697933A
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US2106337A
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US2485748A
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US2523914A
Cited
US2564048A
Cited
US2812388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |