Patent US2451457A successfully refreshed from Google Patents.
US2451457A
Expired / Lapsed
US
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Traffic signal control system
Assignee: Individual
•
Filing: 1940-09-16
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Granted: 1948-10-12
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Expires: 1960-09-16
Abstract
No abstract record available.
Inventors
- 👤 Shepherd Judson O'd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:51
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/07; G08G1/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US206734A
Cited
US1265329A
Cited
FR511877A
Cited
US1554028A
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US1837803A
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US1993056A
Cited
US1849882A
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US1929378A
Cited
US2045127A
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US2081652A
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US2133157A
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USRE21635E
Cited
US2236297A
Cited
US2224697A
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US2103907A
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US2246208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |