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Patent US2516538A successfully refreshed from Google Patents.
US2516538A
Expired / Lapsed
US
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Protective control system
Assignee: Westinghouse Electric Corp
•
Filing: 1948-05-05
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Granted: 1950-07-25
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Expires: 1968-05-05
Abstract
No abstract record available.
Inventors
- 👤 George C Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:48
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1312454A
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US2324525A
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US1561386A
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GB292922A
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US1716164A
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US1761764A
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US1764375A
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US2296969A
Cited
US2255638A
Cited
US2322069A
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US2339125A
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US2429819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |