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 20:30
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1867833A
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US2204458A
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US1888814A
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US2000750A
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US2124772A
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US2139076A
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US2361558A
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US2377249A
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US2626829A
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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 |