Patent US2636081A successfully refreshed from Google Patents.
US2636081A
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Supervisory circuits for pulse code modulation
Assignee: AT&T Inc
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Filing: 1950-07-27
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Granted: 1953-04-21
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Expires: 1970-07-27
Abstract
No abstract record available.
Inventors
- 👤 Carl B H Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:14
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/12; H04J3/06; H04J3/0602; H04J3/0605; H04J3/125
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) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |