US2853553A
Expired / Lapsed
US
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Assignee: AT&T Inc
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Filing: 1955-12-28
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Granted: 1958-09-23
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Expires: 1975-12-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Milton L Almquist
- 👤 Jr Amos E Joel
- 👤 Posin Melvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:55
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0008; H04M; H04M15/00; H04M15/08; H04Q3/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |