US3489438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well tubing having noncommunicating fluid passages
Assignee: Denali Services Co Inc
•
Filing: 1968-04-08
•
Granted: 1970-01-13
•
Expires: 1988-04-08
Abstract
No abstract record available.
Inventors
- 👤 William F Mcclure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:16
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1521482A
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US1909075A
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US1862260A
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US2494803A
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US2850264A
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US3280925A
Cited
FR1304772A
Cited
US3268017A
Cited
US3297100A
Cited
FR1403800A
Cited
US3323604A
Cited
US3451475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |