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US2642847A
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Electric control system for hydraulic step drilling machines
Assignee: Leland Gifford Co
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Filing: 1948-03-16
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Granted: 1953-06-23
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Expires: 1968-03-16
Abstract
No abstract record available.
Inventors
- 👤 Alden T Roys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:00
CPC Classifications
B; B23; B23Q; B23Q15/00; B23B; B23B41/00; B23B41/02; Y; Y10; Y10T; Y10T408/00; Y10T408/23; Y10T408/65; Y10T408/675; Y10T408/6757
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1496953A
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US2051052A
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US1911138A
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US1911132A
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US2287559A
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US2245080A
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US2310124A
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US2324727A
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US2375946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |