US2895056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-biased control systems for electrical generating units
Assignee: Leeds and Northrup Co
•
Filing: 1957-07-08
•
Granted: 1959-07-14
•
Expires: 1977-07-08
Abstract
No abstract record available.
Inventors
- 👤 Edward S Bristol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:07
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/38; H02J3/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2243944A
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US2113164A
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US2053061A
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US2433725A
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US2754429A
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US2681418A
Cited
US2773994A
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US2784912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-13 | 1963-01-12 | 1963-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-13 | 1967-01-12 | 1967-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-13 | 1971-01-12 | 1971-07-14 | $7700.00 | Window Closed / Lapsed |