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Patent US2879034A successfully refreshed from Google Patents.
US2879034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work engaging support for a rock drill
Assignee: Joy Manufacturing Co
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Filing: 1955-08-18
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Granted: 1959-03-24
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Expires: 1975-08-18
Abstract
No abstract record available.
Inventors
- 👤 David M Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:01
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/025; E21B19/00; E21B19/08; E21B19/084; E21B19/24; E21B7/022
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) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |