Patent US3796171A successfully refreshed from Google Patents.
Patent US2614807A successfully refreshed from Google Patents.
US2614807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drilling apparatus
Assignee: Joy Manufacturing Co
•
Filing: 1947-10-21
•
Granted: 1952-10-21
•
Expires: 1967-10-21
Abstract
No abstract record available.
Inventors
- 👤 John C Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:56
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/025; E21D; E21D9/00; E21D9/12; E21D9/122
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US920135A
Cited
US1112543A
Cited
US1262361A
Cited
US1543765A
Cited
US2348899A
Cited
US2379137A
Cited
US2396365A
Cited
US2500931A
Cited
US2445004A
Cited
US2468378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |