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Patent US2639895A successfully refreshed from Google Patents.
US2639895A
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Self-propelled drilling machine
Assignee: CHARLES BITNER
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Filing: 1951-03-23
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Granted: 1953-05-26
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Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 Richard L Gallo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:45
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1098014A
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US2044878A
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US2268573A
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US2271821A
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US2365749A
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US2396365A
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US2377279A
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US2389558A
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US2512497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |