Patent US2639415A successfully refreshed from Google Patents.
US2639415A
Expired / Lapsed
US
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Indicator selecting and lock-in circuit
Assignee: AT&T Inc
•
Filing: 1948-10-27
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Granted: 1953-05-19
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Expires: 1968-10-27
Abstract
No abstract record available.
Inventors
- 👤 Mallery Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:01
CPC Classifications
G; G06; G06K; G06K21/00; G06K21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US727702A
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US804182A
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US1704736A
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GB314112A
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US1967887A
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US2056361A
Cited
GB499900A
Cited
US2423119A
Cited
US2424243A
Cited
US2441557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |