US3238024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the zonemelting of nonconductive or poorly conductive substances
Assignee: Knapsack AG
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Filing: 1962-03-14
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Granted: 1966-03-01
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Expires: 1982-03-14
Abstract
No abstract record available.
Inventors
- 👤 Cremer Joseph
- 👤 Kribbe Harri
- 👤 Ritter Friedbert
- 👤 Rodis Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:18
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; C30B13/18; C01; C01B; C01B25/00; C01B25/04; C01B25/047; C07; C07C; C07C7/00; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/1088
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN THE PROCESS OF ZONE-REFINING PHOSPHORUS BY MELTING WITH A FERROMAGNETIC INDUCTIVELY HEATED SUSCEPTOR A ZONE OF THE PHOSPHORUS SUBSTANCE TO BE REFINED HAVING AN ELECTRICAL CONDUCTIVITY SMALLER THAN THAT OF SEMICONDUCTORS AND A MELTING POINT BELOW THE CURIE POINT OF THE MATERIAL USED FOR THE SUSCEPTOR AND MOVING SAID MOLTEN ZONE THROUGH SAID SUBSTANCE BY EFFECTING A RELATIVE MOTION BETWEEN SUSCEPTOR AND SUBSTANCE, THE IMPROVEMENT WHICH COMPRISES EMBEDDING THE FEROMAGNETIC SUSCEPTOR IN THE SUBSTANCE TO BE REFINED AND KEEPING SAID SUSCEPTOR FREELY SUSPENDED IN THE MOLTEN ZONE BY MAGNETIC FIELD FORCES
Claim 2
Dependent Claim
92 words
IN THE PROCESS OF ZONE-REFINING PHOSPHORUS BY MELTING WITH A FERROMAGNETIC INDUCTIVELY HEATED SUSCEPTOR A ZONE OF THE PHOSPHORUS SUBSTANCE TO BE REFINED HAVING AN ELECTRICAL CONDUCTIVITY SMALLER THAN THAT OF SEMICONDUCTORS AND A MELTING POINT BELOW THE CURIE POINT OF THE MATERIAL USED FOR THE SUSCEPTOR AND MOVING SAID MOLTEN ZONE THROUGH SAID SUBSTANCE BY EFFECTING A RELATIVE MOTION BETWEEN SUSCEPTOR AND SUBSTANCE, THE IMPROVEMENT WHICH COMPRISES EMBEDDING THE FEROMAGNETIC SUSCEPTOR IN THE SUBSTANCE TO BE REFINED AND KEEPING SAID SUSCEPTOR FREELY SUSPENDED IN THE MOLTEN ZONE BY MAGNETIC FIELD FORCES
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |