US2438682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and materials for cleaning oil wells and equipment
Assignee: Individual
•
Filing: 1945-08-07
•
Granted: 1948-03-30
•
Expires: 1965-08-07
Abstract
No abstract record available.
Inventors
- 👤 Pearlie B Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 07:55
CPC Classifications
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)
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US1439128A
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US2386605A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-30 | 1951-09-29 | 1952-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-30 | 1955-09-29 | 1956-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-30 | 1959-09-29 | 1960-03-30 | $7700.00 | Window Closed / Lapsed |