Patent US2583044A successfully refreshed from Google Patents.
US2583044A
Expired / Lapsed
US
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Scraper for removing paraffin from oil well pipes
Assignee: Individual
•
Filing: 1949-12-06
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Granted: 1952-01-22
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Expires: 1969-12-06
Abstract
No abstract record available.
Inventors
- 👤 Charles W Earl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:45
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US712488A
Cited
US1755762A
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US2201680A
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US2228648A
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US2290429A
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US2466239A
Cited
US2521076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |