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US1852717A
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Gas lift appliance for oil wells
Assignee: Union Oil Company of California
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Filing: 1930-09-08
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Granted: 1932-04-05
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Expires: 1950-09-08
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Grinnell
- 👤 Albert C Rubel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:18
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/18; E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/068; E21B43/00; E21B43/12; E21B43/121; E21B43/122; Y; Y10; Y10S; Y10S137/00; Y10S137/901; Y10T; Y10T137/00; Y10T137/5109; Y10T137/598; Y10T137/6116; Y10T137/6154; Y10T137/6851; Y10T137/6966; Y10T137/6991; Y10T137/6995; Y10T137/7017; Y10T137/9682; Y10T29/00; Y10T29/53; Y10T29/53552
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) | 1935-04-05 | 1935-10-05 | 1936-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-04-05 | 1939-10-05 | 1940-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-04-05 | 1943-10-05 | 1944-04-05 | $7700.00 | Window Closed / Lapsed |