Patent US2581943A successfully refreshed from Google Patents.
US2581943A
Expired / Lapsed
US
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Means for eliminating dust produced by pneumatic drills
Assignee: Aerosol Corp of America
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Filing: 1946-11-29
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Granted: 1952-01-08
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Expires: 1966-11-29
Abstract
No abstract record available.
Inventors
- 👤 Dautreban Lucien Jean-Baptiste
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:44
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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |