US2668593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for scraping and testing well tubing
Assignee: Sunoco Inc
•
Filing: 1950-01-14
•
Granted: 1954-02-09
•
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 10:10
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02; E21B37/04; E21B37/045
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US68917A
Cited
US576425A
Cited
US1260241A
Cited
US1547440A
Cited
US1810260A
Cited
US2094897A
Cited
US2143450A
Cited
US2179812A
Cited
US2225413A
Cited
US2245128A
Cited
US2295058A
Cited
US2427632A
Cited
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 |