US2449841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for washing over, releasing, and withdrawing tubular tructures from wells
Assignee: Individual
•
Filing: 1947-03-06
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Granted: 1948-09-21
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Expires: 1967-03-06
Abstract
No abstract record available.
Inventors
- 👤 Robbins M Claypool
- 👤 David M Best
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:11
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/06; E21B31/00; Y; Y10; Y10S; Y10S285/00; Y10S285/915; Y10S285/922; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1908
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-21 | 1952-03-22 | 1952-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-21 | 1956-03-22 | 1956-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-21 | 1960-03-22 | 1960-09-21 | $7700.00 | Window Closed / Lapsed |