US2143251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and equipment for acidizing wells
Assignee: Halliburton Oil Well Cementing Co
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Filing: 1938-06-21
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Granted: 1939-01-10
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Expires: 1958-06-21
Abstract
No abstract record available.
Inventors
- 👤 Christian W Savitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-01-09 | 1942-07-11 | 1943-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-09 | 1946-07-11 | 1947-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-09 | 1950-07-11 | 1951-01-10 | $7700.00 | Window Closed / Lapsed |