Patent US190030A successfully refreshed from Google Patents.
US190030A
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Improvement in exhaust-valves for air-brakes
Assignee: —
•
Filing: —
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Granted: 1877-04-24
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Expires: 1894-04-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:01
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/7722; Y10T137/7781; Y10T137/7832; Y10T137/8158; Y10T137/8359
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1880-04-23 | 1880-10-23 | 1881-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1884-04-23 | 1884-10-23 | 1885-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1888-04-23 | 1888-10-23 | 1889-04-24 | $7700.00 | Window Closed / Lapsed |