US3477566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the electrostatic separation of the sylvite (kci) component of a mineral
Assignee: Kali Forschungs Anstalt GmbH
•
Filing: 1966-12-12
•
Granted: 1969-11-11
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Expires: 1986-12-12
Abstract
No abstract record available.
Inventors
- 👤 Hans Autenrieth
- 👤 Heinrich Wirries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:19
CPC Classifications
B; B03; B03C; B03C7/00; B03C7/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA650049A
Cited
US2090418A
Cited
US2188932A
Cited
US2593431A
Cited
US3049233A
Cited
DE1108632B
Cited
US3008573A
Cited
US3388794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |