Patent US3497055A successfully refreshed from Google Patents.
US3497055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tram control system
Assignee: Westinghouse Air Brake Co
•
Filing: 1967-08-28
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Granted: 1970-02-24
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Expires: 1987-08-28
Abstract
No abstract record available.
Inventors
- 👤 Frank E Oslakovic
- 👤 Donald C Reilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:58
CPC Classifications
E; E21; E21F; E21F13/00; E21F13/02; B; B65; B65G; B65G37/00; B65G2812/00; B65G2812/01; B65G2812/012; B65G2812/014; B65G2812/015
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3227235A
Cited
US3339658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |