US3020962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well installations and improved tubing therefor
Assignee: Armco Inc
•
Filing: 1958-02-03
•
Granted: 1962-02-13
•
Expires: 1978-02-03
Abstract
No abstract record available.
Inventors
- 👤 John L Holmquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:27
CPC Classifications
E; E21; E21B; E21B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1055674A
Cited
US1330316A
Cited
US1644823A
Cited
US1879663A
Cited
US2712854A
Cited
US2758612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |