Patent US2572027A successfully refreshed from Google Patents.
US2572027A
Expired / Lapsed
US
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Relay set-subscriber's lockout circuit
Assignee: STC PLC
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Filing: 1946-11-30
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Granted: 1951-10-23
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Expires: 1966-11-30
Abstract
No abstract record available.
Inventors
- 👤 Henry L Horwitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:24
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08; H04M3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1200841A
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US1610346A
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US1671791A
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US1759267A
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US1738564A
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US1871300A
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US1941085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |