Patent US5555196A successfully refreshed from Google Patents.
Patent US2703532A successfully refreshed from Google Patents.
US2703532A
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Electromechanical gas lift valve and control system therefor
Assignee: Phillips Petroleum Co
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Filing: 1949-02-23
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Granted: 1955-03-08
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Expires: 1969-02-23
Abstract
No abstract record available.
Inventors
- 👤 Bobo Roy Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:46
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/066; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; E21B43/1235; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2145402A
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US2337651A
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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) | 1958-03-07 | 1958-09-06 | 1959-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-07 | 1962-09-06 | 1963-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-07 | 1966-09-06 | 1967-03-08 | $7700.00 | Window Closed / Lapsed |