US2975847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatically operable rock drill dust collector
Assignee: Westinghouse Air Brake Co
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Filing: 1958-10-08
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Granted: 1961-03-21
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Expires: 1978-10-08
Abstract
No abstract record available.
Inventors
- 👤 Jacob E Feucht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:03
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/07
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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |