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US3489221A
Expired / Lapsed
US
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Well completion apparatus and method
Assignee: Vetco Gray LLC
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Filing: 1968-06-17
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Granted: 1970-01-13
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Expires: 1988-06-17
Abstract
No abstract record available.
Inventors
- 👤 Robert L Crain
- 👤 Marvin L Holbert Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:30
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10; E21B43/101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2228503A
Cited
US3287030A
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US3223159A
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US3253655A
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US3318382A
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US3335799A
Cited
US3424477A
Cited
US3400950A
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 |