US2991966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescoping mast and elevator mechanism for stabilizing drill unit
Assignee: Individual
•
Filing: 1959-04-06
•
Granted: 1961-07-11
•
Expires: 1979-04-06
Abstract
No abstract record available.
Inventors
- 👤 Daniel W Varel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:43
CPC Classifications
E; E04; E04H; E04H12/00; E04H12/18; B; B25; B25H; B25H1/00; B25H1/0021; Y; Y10; Y10S; Y10S408/00; Y10S408/712; Y10T; Y10T408/00; Y10T408/91; Y10T408/93
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US472160A
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US1324058A
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US942592A
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US1499755A
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US2012628A
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US2244778A
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US2298741A
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US2451733A
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US2473947A
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US2532168A
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US2637313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |