Patent US2437790A successfully refreshed from Google Patents.
US2437790A
Expired / Lapsed
US
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Electric circuit controller
Assignee: Trans Lux Corp
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Filing: 1944-07-27
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Granted: 1948-03-16
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Expires: 1964-07-27
Abstract
No abstract record available.
Inventors
- 👤 Bert W Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:39
CPC Classifications
H; H01; H01H; H01H67/00; H01H67/22; H01H67/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE20462E
Cited
US1973539A
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US1991984A
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US2063830A
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US2087674A
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US2183022A
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US2255201A
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US2267936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-16 | 1951-09-15 | 1952-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-16 | 1955-09-15 | 1956-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-16 | 1959-09-15 | 1960-03-16 | $7700.00 | Window Closed / Lapsed |