Patent US2832579A successfully refreshed from Google Patents.
US2832579A
Expired / Lapsed
US
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Mining machine bit tip patterns
Assignee: Joy Manufacturing Co
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Filing: 1954-07-12
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Granted: 1958-04-29
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Expires: 1974-07-12
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:01
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US772152A
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US945335A
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US1528546A
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GB338336A
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US2304143A
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US2676005A
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US2650813A
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US2602343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-28 | 1961-10-28 | 1962-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-28 | 1965-10-28 | 1966-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-28 | 1969-10-28 | 1970-04-29 | $7700.00 | Window Closed / Lapsed |