US2638308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety valve for air brake systems and the like
Assignee: Individual
•
Filing: 1947-12-23
•
Granted: 1953-05-12
•
Expires: 1967-12-23
Abstract
No abstract record available.
Inventors
- 👤 Eugene L Kell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:11
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/20; F16K17/22; F16K17/24; F16K17/28; F16K17/285; B; B60; B60T; B60T17/00; B60T17/18; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7869; Y10T137/7871; Y10T137/7873
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US398111A
Cited
DE97900C
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US833581A
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GB191101624A
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US1339383A
Cited
FR538306A
Cited
US1658099A
Cited
US1786848A
Cited
CH166883A
Cited
GB551386A
Cited
US2475585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |