US2639149A
Expired / Lapsed
US
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Assignee: AT&T Inc
•
Filing: 1949-11-04
•
Granted: 1953-05-19
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Expires: 1969-11-04
Abstract
No abstract record available.
Inventors
- 👤 Leon N Hampton
- 👤 Salzer Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:16
CPC Classifications
G; G06; G06K; G06K13/00; G06K13/02; G06K13/07; G06K13/077; H; H04; H04M; H04M3/00; H04M3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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 |