US2845251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile rock drill rig
Assignee: Joy Manufacturing Co
•
Filing: 1956-04-03
•
Granted: 1958-07-29
•
Expires: 1976-04-03
Abstract
No abstract record available.
Inventors
- 👤 Douglas R Barton
- 👤 John C Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:52
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/025; E21B7/022
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1535411A
Cited
US2174415A
Cited
US2446242A
Cited
US2621896A
Cited
US2614808A
Cited
US2745637A
Cited
US2665116A
Cited
US2750155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |