US2223336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for gas lift pumping apparatus
Assignee: National Supply Co
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Filing: 1937-11-17
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Granted: 1940-11-26
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Expires: 1957-11-17
Abstract
No abstract record available.
Inventors
- 👤 George A Hatfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:00
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/18; E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934; Y10T137/4238; Y10T137/4245; Y10T137/4252; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7905; Y10T137/7907; Y10T137/794; Y10T137/8085
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) | 1943-11-26 | 1944-05-27 | 1944-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-26 | 1948-05-27 | 1948-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-26 | 1952-05-27 | 1952-11-26 | $7700.00 | Window Closed / Lapsed |