Patent US3412798A successfully refreshed from Google Patents.
US3412798A
Expired / Lapsed
US
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Method and apparatus for treating gas lift wells
Assignee: Individual
•
Filing: 1967-07-10
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Granted: 1968-11-26
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Expires: 1987-07-10
Abstract
No abstract record available.
Inventors
- 👤 Jerry K Gregston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:25
CPC Classifications
E; E21; E21B; E21B37/00; E21B33/00; E21B33/02; E21B33/03; E21B33/068
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) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |