Patent US2894585A successfully refreshed from Google Patents.
US2894585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic washout tool
Assignee: Individual
•
Filing: 1954-09-01
•
Granted: 1959-07-14
•
Expires: 1974-09-01
Abstract
No abstract record available.
Inventors
- 👤 Weldon C Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:41
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/03
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1867833A
Cited
US2204458A
Cited
US1888814A
Cited
US2000750A
Cited
US2124772A
Cited
US2139076A
Cited
US2361558A
Cited
US2377249A
Cited
US2626829A
Cited
US2525954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-13 | 1963-01-12 | 1963-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-13 | 1967-01-12 | 1967-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-13 | 1971-01-12 | 1971-07-14 | $7700.00 | Window Closed / Lapsed |