Patent US3449593A successfully refreshed from Google Patents.
US3449593A
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Signal slope derivative detection apparatus
Assignee: Digitronics Corp
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Filing: 1964-10-26
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Granted: 1969-06-10
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Expires: 1984-10-26
Abstract
No abstract record available.
Inventors
- 👤 Francis C Marino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:31
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/122; H; H03; H03K; H03K5/00; H03K5/153; H03K5/1532; H03K5/1536
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3187273A
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US3171041A
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US3214606A
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US3217183A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |