Patent US2657541A successfully refreshed from Google Patents.
US2657541A
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Method and apparatus for pumping volatile liquids
Assignee: Air Products Inc
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Filing: 1950-04-10
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Granted: 1953-11-03
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Expires: 1970-04-10
Abstract
No abstract record available.
Inventors
- 👤 Clarence J Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:24
CPC Classifications
F; F17; F17C; F17C7/00; F17C7/02; F17C7/04; F17C2201/00; F17C2201/01; F17C2201/0104; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/3127; Y10T137/313; Y10T137/6416; Y10T137/6552
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) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |