US2495352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well repair
Assignee: Dow Chemical Co
•
Filing: 1945-12-12
•
Granted: 1950-01-24
•
Expires: 1965-12-12
Abstract
No abstract record available.
Inventors
- 👤 Ralph H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:13
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/134; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49718
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190406507A
Cited
US1269090A
Cited
US1404353A
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US1369891A
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US1567109A
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US2164266A
Cited
US2219319A
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US2312862A
Cited
US2372461A
Cited
US2447629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |