US3253141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for railway classification yard
Assignee: SPX Technologies Inc
•
Filing: 1956-04-13
•
Granted: 1966-05-24
•
Expires: 1976-04-13
Abstract
No abstract record available.
Inventors
- 👤 Jr John H Auer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:52
CPC Classifications
B; B61; B61L; B61L17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1766539A
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US2045201A
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US2101184A
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US2320802A
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US2331125A
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US2361466A
Cited
FR921845A
Cited
US2669489A
Cited
US2770775A
Cited
US3125315A
Cited
US3169736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |