US2645289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Displacement type sampler
Assignee: Standard Oil Development Co
•
Filing: 1947-09-16
•
Granted: 1953-07-14
•
Expires: 1967-09-16
Abstract
No abstract record available.
Inventors
- 👤 William J Leas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:46
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/081; E21B49/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE352600C
Cited
US688449A
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US2099877A
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US2147983A
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US2161557A
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US2303727A
Cited
US2364464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |