US2868511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for rotary drilling
Assignee: Joy Manufacturing Co
•
Filing: 1955-04-07
•
Granted: 1959-01-13
•
Expires: 1975-04-07
Abstract
No abstract record available.
Inventors
- 👤 James L Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:37
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/14; E21B10/02; E21B10/04; E21B4/00; E21B4/06; E21B4/14; E21B4/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1660201A
Cited
US1891416A
Cited
US1861042A
Cited
US2228286A
Cited
US2710740A
Cited
US2725215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |