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US2967232A
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Switch and signal control system for railroads
Assignee: SPX Technologies Inc
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Filing: 1957-03-20
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Granted: 1961-01-03
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Expires: 1977-03-20
Abstract
No abstract record available.
Inventors
- 👤 Glenn O Ferm
- 👤 Willis R Smith
- 👤 Reginald F Albrighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:57
CPC Classifications
B; B61; B61L; B61L19/00; B61L19/06; B61L7/00; B61L7/06; B61L7/08; B61L7/088; B61L2205/00; B61L2205/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2152384A
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US2197130A
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US2152390A
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US2176600A
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US2090912A
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US2229736A
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US2832901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |