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US2635697A
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Apparatus for cementing wells
Assignee: Standard Oil Development Co
•
Filing: 1949-06-29
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Granted: 1953-04-21
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Expires: 1969-06-29
Abstract
No abstract record available.
Inventors
- 👤 George E Cannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:43
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US884675A
Cited
US1569293A
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US1906312A
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US2109058A
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US2153034A
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US2217708A
Cited
US2253536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |