US2353372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing fluid loss from well holes into the surrounding earth
Assignee: Dow Chemical Co
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Filing: 1940-06-17
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Granted: 1944-07-11
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Expires: 1960-06-17
Abstract
No abstract record available.
Inventors
- 👤 John B Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:13
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516; E; E21; E21B; E21B21/00; E21B21/003; Y; Y10; Y10S; Y10S47/00; Y10S47/10; Y10S507/00; Y10S507/906; Y10S507/925
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) | 1947-07-11 | 1948-01-10 | 1948-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-07-11 | 1952-01-10 | 1952-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-07-11 | 1956-01-10 | 1956-07-11 | $7700.00 | Window Closed / Lapsed |