Patent US2898531A successfully refreshed from Google Patents.
US2898531A
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Motor differential frequency integrator
Assignee: General Precision Laboratory Inc
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Filing: 1956-12-31
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Granted: 1959-08-04
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Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 John W Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:46
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/188
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2259958A
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US2230715A
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US2418134A
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US2389367A
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US2432141A
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US2432140A
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US2693563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |