Patent US2977825A successfully refreshed from Google Patents.
US2977825A
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US
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Electromagnetic drill support with auxiliary power supply
Assignee: Buck Manufacturing Co
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Filing: 1958-08-20
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Granted: 1961-04-04
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Expires: 1978-08-20
Abstract
No abstract record available.
Inventors
- 👤 Eugene W Buck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:12
CPC Classifications
B; B25; B25H; B25H1/00; B25H1/0021; B25H1/0057; B25H1/0064; B25H1/0071; Y; Y10; Y10S; Y10S408/00; Y10S408/712; Y10T; Y10T408/00; Y10T408/55; Y10T408/554
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1756589A
Cited
US1882472A
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US2062274A
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US2335167A
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GB596679A
Cited
US2820377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |