US3667934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining of zinc
Assignee: ISC Alloys Ltd
•
Filing: 1969-10-15
•
Granted: 1972-06-06
•
Expires: 1989-10-15
Abstract
Abstract ZINC WHICH CONTAINS ALUMINIUM AS AN IMPURITY IS PURIFIED BY TREATING THE MOLTEN WITH CHLORINE, IN FREE OR CONBINED FORM, UNDER A MOLTEN BLUX FORMED FROM SODIUM CHLORIDE AND ALUMINIUM CHLORIDE.
Inventors
- 👤 Leslie Jack Derham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:59
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/04; C22B19/32
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |