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US3469885A
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Oscillating cutter ripper miner
Assignee: Westinghouse Air Brake Co
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Filing: 1968-10-15
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Granted: 1969-09-30
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Expires: 1988-10-15
Abstract
No abstract record available.
Inventors
- 👤 Gustaf Albert Marberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:49
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19032E
Cited
US1244178A
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US1660083A
Cited
US1456930A
Cited
US2695164A
Cited
DE1186435B
Cited
US3382003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |