US2476269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical differentiator for smoothing target tracking data
Assignee: AT&T Inc
•
Filing: 1945-08-20
•
Granted: 1949-07-19
•
Expires: 1965-08-20
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Blackman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:01
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/02; G01P3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2089878A
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US2071424A
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US2136213A
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US2206875A
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US2248072A
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US2377898A
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US2433006A
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US2426584A
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US2442792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-18 | 1953-01-17 | 1953-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-18 | 1957-01-17 | 1957-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-18 | 1961-01-17 | 1961-07-19 | $7700.00 | Window Closed / Lapsed |