US2488949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust valve
Assignee: Fawick Airflex Co
•
Filing: 1945-11-17
•
Granted: 1949-11-22
•
Expires: 1965-11-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:12
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/7722; Y10T137/7781; Y10T137/7832
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US331789A
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US977486A
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US1138278A
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US1406216A
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US1986206A
Cited
US2069366A
Cited
GB502224A
Cited
US2358228A
Cited
US2408799A
Cited
US2360839A
Cited
US2431936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |