US2838121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well casing scraping and polishing tool
Assignee: Individual
•
Filing: 1953-10-14
•
Granted: 1958-06-10
•
Expires: 1973-10-14
Abstract
No abstract record available.
Inventors
- 👤 William E Coyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:01
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1484353A
Cited
US1839771A
Cited
US2334788A
Cited
US2275939A
Cited
US2443941A
Cited
US2667930A
Cited
US2670046A
Cited
US2695673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |