Patent US2697943A successfully refreshed from Google Patents.
US2697943A
Expired / Lapsed
US
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Shutoff mechanism for air separators
Assignee: Bowser Inc
•
Filing: 1948-11-26
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Granted: 1954-12-28
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Expires: 1968-11-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Pressler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:19
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/42; G; G01; G01F; G01F15/00; G01F15/08; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3021; Y10T137/304; Y10T137/3052; Y10T137/3068
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |