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US2631480A
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Hydraulic step drilling unit
Assignee: CHARLES LEITSCHUH
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Filing: 1951-03-05
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Granted: 1953-03-17
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Expires: 1971-03-05
Abstract
No abstract record available.
Inventors
- 👤 Paul W Romine
- 👤 Armstrong Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:41
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/22; B23Q5/26; B23Q5/261; B23Q5/263; B23Q5/265; Y; Y10; Y10S; Y10S408/00; Y10S408/704; Y10S408/705; Y10T; Y10T408/00; Y10T408/23; Y10T408/65; Y10T408/675; Y10T408/6757
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) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |