Patent US2445659A successfully refreshed from Google Patents.
US2445659A
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Cleanout apparatus for drill steel
Assignee: AUGUST R KURTZ
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Filing: 1945-09-24
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Granted: 1948-07-20
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Expires: 1965-09-24
Abstract
No abstract record available.
Inventors
- 👤 Brown Clarence James
- 👤 Brown Floyd Stillmen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:44
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7772; Y10T137/7774; Y10T279/00; Y10T279/17; Y10T279/17042; Y10T279/17085; Y10T279/17111
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) | 1951-07-20 | 1952-01-19 | 1952-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-20 | 1956-01-19 | 1956-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-20 | 1960-01-19 | 1960-07-20 | $7700.00 | Window Closed / Lapsed |