US3550132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital phase locked loop
Assignee: AT&T Inc
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Filing: 1967-12-27
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Granted: 1970-12-22
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Expires: 1987-12-27
Abstract
No abstract record available.
Inventors
- 👤 Carl F Kurth
- 👤 Roderick C Maclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/09; H04; H04B; H04B14/00; H04B14/002; H04B14/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |