Patent US2684684A successfully refreshed from Google Patents.
US2684684A
Expired / Lapsed
US
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Automatic air bleeder valve for hydraulic systems
Assignee: ANCO Inc
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Filing: 1951-08-30
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Granted: 1954-07-27
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Expires: 1971-08-30
Abstract
No abstract record available.
Inventors
- 👤 Stevenson Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:55
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/04; F15B21/044; F16; F16K; F16K24/00; F16K24/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3084; Y10T137/309
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |