US3621664A
Expired / Lapsed
US
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Fractional crystallization process
Assignee: BUCHS METALLWERK AG
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Filing: 1968-04-11
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Granted: 1971-11-23
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Expires: 1988-04-11
Abstract
Abstract A SINGLE OR MULTIPLE-STEP FRACTIONAL CRYSTALLIZTION PROCESS AND APPARATUS FOR SEPARATING FLUID MATERIAL HAVING TWO OR MORE COMPONENTS, THE MATERIAL FLOWING DOWN A COOLED WALL SURFACE AND A COMPONENTL CRYSTALLIZING THEREON. EACH STEP COMPRISES A SINGLE CRYSTALLIZATION AND ALL STEPS OF A COMPLETE CYCLE ARE CONDUCTED WITHIN A SINGLE CRYSTALLIZER.
Inventors
- 👤 Kurt Saxer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:34
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/14; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0036; B01D9/004; B02; B02C; B02C23/00; B02C23/04
Claims Analysis
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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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |