US2556070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit arrangement
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-04-08
•
Granted: 1951-06-05
•
Expires: 1966-04-08
Abstract
No abstract record available.
Inventors
- 👤 Groot Folkert Albert De
- 👤 Schenau Bernardus Willem Ingen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:24
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/02; H03G; H03G3/00; H03G3/20; H03G3/22; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1931866A
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US2111778A
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US2111386A
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US2357984A
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US2167462A
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US2240428A
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US2375283A
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US2252066A
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US2404160A
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US2243921A
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US2330499A
Cited
US2274648A
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US2404712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |