Patent US2110260A successfully refreshed from Google Patents.
US1870320A
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Method for cleaning oil wells
Assignee: DRACKETT CHEMICAL Co
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Filing: 1932-03-16
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Granted: 1932-08-09
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Expires: 1952-03-16
Abstract
No abstract record available.
Inventors
- 👤 Adams Edward Maurice
- 👤 Gangloff Wilmer Charles
- 👤 Grace G Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:32
CPC Classifications
E; E21; E21B; E21B36/00; C; C09; C09K; C09K8/00; C09K8/52; C09K8/524; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/929; Y10S507/93; Y10S507/931
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) | 1935-08-09 | 1936-02-08 | 1936-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-09 | 1940-02-08 | 1940-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-09 | 1944-02-08 | 1944-08-09 | $7700.00 | Window Closed / Lapsed |