US2749104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auger drill head
Assignee: Joy Manufacturing Co
•
Filing: 1952-01-26
•
Granted: 1956-06-05
•
Expires: 1972-01-26
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:20
CPC Classifications
E; E21; E21C; E21C25/00; E21C25/58; E21B; E21B10/00; E21B10/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US476836A
Cited
US1511957A
Cited
US1603621A
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US2161000A
Cited
US2562841A
Cited
US2575975A
Cited
US2594256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |