US2736886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system providing time-delayed distinctive call signalling
Assignee: TDK Micronas GmbH
•
Filing: 1952-05-03
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Granted: 1956-02-28
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Expires: 1972-05-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Arthur J Radcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:56
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50; H04M3/51; H04M3/523
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1742927A
Cited
US2396898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |