US2786904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control switch for railway traffic controlling systems
Assignee: SPX Technologies Inc
•
Filing: 1954-05-13
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Granted: 1957-03-26
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Expires: 1974-05-13
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Hewes
- 👤 Kramer Isaac A De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:50
CPC Classifications
B; B61; B61L; B61L19/00; B61L19/06; B61L19/14; B61L25/00; B61L25/06; B61L25/08; H; H01; H01H; H01H13/00; H01H13/02; H01H13/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1110027A
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US1521591A
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US2149226A
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US2305185A
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US2253335A
Cited
US2400952A
Cited
GB623694A
Cited
US2548103A
Cited
US2669611A
Cited
US2668200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |