US3051245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tools for subsurface flow control
Assignee: Johnston Testers Inc
•
Filing: 1958-08-19
•
Granted: 1962-08-28
•
Expires: 1978-08-19
Abstract
No abstract record available.
Inventors
- 👤 Norman K Andrew
- 👤 Hugh E Metcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:04
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/081; E21B49/082; E21B49/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1790424A
Cited
US2073107A
Cited
US2703696A
Cited
US2737246A
Cited
US2799346A
Cited
US2901001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |