Patent US2969844A successfully refreshed from Google Patents.
US2969844A
Expired / Lapsed
US
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Earth boring implement
Assignee: Individual
•
Filing: 1957-12-26
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Granted: 1961-01-31
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Expires: 1977-12-26
Abstract
No abstract record available.
Inventors
- 👤 Hamrick Wellington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:04
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/96; E02F3/961; E02F3/963; E21; E21B; E21B19/00; E21B19/08; E21B19/087; E21B3/00; E21B3/02; E21B3/022; Y; Y10; Y10S; Y10S37/00; Y10S37/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |