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Patent US2505260A successfully refreshed from Google Patents.
US2505260A
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Control apparatus
Assignee: Westinghouse Air Brake Co
•
Filing: 1945-04-07
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Granted: 1950-04-25
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Expires: 1965-04-07
Abstract
No abstract record available.
Inventors
- 👤 Roy R Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:09
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US985958A
Cited
US1091160A
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US1541712A
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US1927700A
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US2174292A
Cited
US2237647A
Cited
US2368877A
Cited
US2395202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |