US3681246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medium for consolidating dust in coal-mines
Assignee: Chemische Fabrik Kalk GmbH
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Filing: 1971-01-18
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Granted: 1972-08-01
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Expires: 1991-01-18
Abstract
Abstract A MEDIUM FOR CONSOLIDATIN DUST IN COAL-MINES AND PREPARATION OF SAID MEDIUM, COMPRISING CALCIUM CHORIDE, MAGNESIUM CHLORIDE OR MXTURES THEREOF INTIMATELY MIXED WITH SODUM CHLORIDE.
Inventors
- 👤 Hans Lewer
- 👤 Hanspeter Dust
- 👤 Martin Thonnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:52
CPC Classifications
E; E21; E21F; E21F5/00; E21F5/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |