Patent US3524937A successfully refreshed from Google Patents.
US3524937A
Expired / Lapsed
US
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Synchronization circuits in a pcm central exchange
Assignee: International Standard Electric Corp
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Filing: 1967-03-08
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Granted: 1970-08-18
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Expires: 1987-03-08
Abstract
No abstract record available.
Inventors
- 👤 Michel Jean Herry
- 👤 Jean Leon Roger Jamet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:54
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/06; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/062; H04J3/0626; H04J3/0629; H04J3/0635; H04J3/0685; H04J3/0688
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3306978A
Cited
US3127475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |