Patent US2640162A successfully refreshed from Google Patents.
US2640162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic transmission system
Assignee: AT&T Inc
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Filing: 1947-05-16
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Granted: 1953-05-26
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Expires: 1967-05-16
Abstract
No abstract record available.
Inventors
- 👤 Espenschied Lloyd
- 👤 Albert M Skellett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:17
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J31/56; H04; H04B; H04B13/00; H04N; H04N7/00; H04N7/06; H04N7/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2092814A
Cited
US2177360A
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US2248977A
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US2153614A
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US2107782A
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US2159568A
Cited
US2143095A
Cited
US2158853A
Cited
US2203225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |