US3451476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple stage cementing
Assignee: Schlumberger Technology Corp
•
Filing: 1967-11-03
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Granted: 1969-06-24
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Expires: 1987-11-03
Abstract
No abstract record available.
Inventors
- 👤 Charles A Pitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:24
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2435016A
Cited
US2998075A
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US3094307A
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US3066735A
Cited
US3151681A
Cited
US3228473A
Cited
US3338311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |