Patent US2474290A successfully refreshed from Google Patents.
US2474290A
Expired / Lapsed
US
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Phase failure indicating device for polyphase systems
Assignee: International Standard Electric Corp
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Filing: 1944-11-02
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Granted: 1949-06-28
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Expires: 1964-11-02
Abstract
No abstract record available.
Inventors
- 👤 Terry Victor John
- 👤 Kelly Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:09
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/32; H02H3/34; H02H3/353
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1298665A
Cited
US1571224A
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US1646028A
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US1526027A
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US1691342A
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US1888718A
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US1980395A
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US1929059A
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DE676295C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |