Patent US2585022A successfully refreshed from Google Patents.
US2585022A
Expired / Lapsed
US
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Ringing current supply system for telephones
Assignee: STC PLC
•
Filing: 1948-08-19
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Granted: 1952-02-12
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Expires: 1968-08-19
Abstract
No abstract record available.
Inventors
- 👤 Elmer F Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:08
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1251363A
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US1546427A
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US1981113A
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US2092442A
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US2104844A
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US2273193A
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US2325829A
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US2346504A
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US2438902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |