Patent US3735335A successfully refreshed from Google Patents.
Patent US2556070A successfully refreshed from Google Patents.
US2556070A
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Control circuit arrangement
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-04-08
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Granted: 1951-06-05
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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 05:52
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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US2240428A
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US2330499A
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US2404712A
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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 |