Patent US2582909A successfully refreshed from Google Patents.
US2582909A
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Preparation and use of fluid plugs in oil well cementing
Assignee: Standard Oil Development Co
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Filing: 1947-09-06
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Granted: 1952-01-15
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Expires: 1967-09-06
Abstract
No abstract record available.
Inventors
- 👤 Lawton L Laurence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:04
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/138; C; C04; C04B; C04B18/00; C04B18/04; C04B18/0481; C04B18/049; C04B28/00; C04B28/02; C09; C09K; C09K8/00; C09K8/42; C09K8/46; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |