US2985241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well screen device
Assignee: Individual
•
Filing: 1958-02-21
•
Granted: 1961-05-23
•
Expires: 1978-02-21
Abstract
No abstract record available.
Inventors
- 👤 Charles W Hanslip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:12
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/084; Y; Y10; Y10S; Y10S166/00; Y10S166/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US934076A
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US921337A
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US997191A
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US1406825A
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US1608709A
Cited
US1811573A
Cited
US1918949A
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US1936663A
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US2590094A
Cited
US2760584A
Cited
US2775302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |