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Patent US2668593A successfully refreshed from Google Patents.
US2668593A
Expired / Lapsed
US
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Device for scraping and testing well tubing
Assignee: Sunoco Inc
•
Filing: 1950-01-14
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Granted: 1954-02-09
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Expires: 1970-01-14
Abstract
No abstract record available.
Inventors
- 👤 Lehman E Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:05
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02; E21B37/04; E21B37/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1547440A
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US1810260A
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US2094897A
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US2295058A
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US2427632A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |