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US2906515A
Expired / Lapsed
US
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Auger type mining machine
Assignee: Chemetron Corp
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Filing: 1955-07-22
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Granted: 1959-09-29
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Expires: 1975-07-22
Abstract
No abstract record available.
Inventors
- 👤 James A Swanson
- 👤 Dallas P Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:37
CPC Classifications
E; E21; E21C; E21C25/00; E21C25/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US866839A
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US1615055A
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US2365680A
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US2510285A
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US2399375A
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US2504232A
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US2616677A
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US2698169A
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US2823898A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |