Patent US2492355A successfully refreshed from Google Patents.
US2492355A
Expired / Lapsed
US
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Smoothing and differentiating circuit
Assignee: Unisys Corp
•
Filing: 1942-12-30
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Granted: 1949-12-27
•
Expires: 1962-12-30
Abstract
No abstract record available.
Inventors
- 👤 David J Campbell
- 👤 Willis G Wing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:00
CPC Classifications
F; F41; F41G; F41G5/00; F41G5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1999368A
Cited
US2065303A
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US2136213A
Cited
US2206875A
Cited
US2251155A
Cited
US2209254A
Cited
US2271688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |