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US3493877A
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Zero-crossing detector for frequency modulated signals
Assignee: Xerox Corp
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Filing: 1967-12-15
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Granted: 1970-02-03
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Expires: 1987-12-15
Abstract
No abstract record available.
Inventors
- 👤 Charles L Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:11
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02; H03D3/04; H03K; H03K5/00; H03K5/153; H03K5/1536; H04; H04L; H04L27/00; H04L27/10; H04L27/14; H04L27/156; H04L27/1563; Y; Y10; Y10T; Y10T408/00; Y10T408/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3307112A
Cited
US3404229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |