Patent US2784944A successfully refreshed from Google Patents.
US2784944A
Expired / Lapsed
US
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Earth boring auger and head therefor
Assignee: Individual
•
Filing: 1953-07-10
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Granted: 1957-03-12
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Expires: 1973-07-10
Abstract
No abstract record available.
Inventors
- 👤 Eugene J Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:27
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/003; E21B7/005; E21B7/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US116883A
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US633574A
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US732859A
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US727322A
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US835125A
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US977877A
Cited
US1067417A
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US1504852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |