US3381220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital frequency and phase detector
Assignee: Circuit Research Corp
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Filing: 1965-01-12
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Granted: 1968-04-30
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Expires: 1985-01-12
Abstract
No abstract record available.
Inventors
- 👤 Robert P Burr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:22
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/26; G; G01; G01R; G01R25/00; G01R25/08; H02; H02P; H02P23/00; H02P23/18; H02P23/186; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/183
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |