Patent US2642889A successfully refreshed from Google Patents.
US2642889A
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Gas lift valve
Assignee: Cummings Inc
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Filing: 1951-03-19
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Granted: 1953-06-23
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Expires: 1971-03-19
Abstract
No abstract record available.
Inventors
- 👤 Leslie L Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:09
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/145; F16K15/16; F16K15/162; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7879; Y10T137/7888; Y10T137/7889; Y10T137/7891; Y10T137/7892
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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |