US3282641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scavenger and process for purification of metal fluorides
Assignee: Harshaw Chemical Co
•
Filing: 1963-10-09
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Granted: 1966-11-01
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Expires: 1983-10-09
Abstract
No abstract record available.
Inventors
- 👤 Sfiligoj Marko
- 👤 Carl F Swinehart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:26
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/02; C; C01; C01D; C01D3/00; C01D3/14; C01D3/20; C01F; C01F11/00; C01F11/20; C01F11/22; C01F17/00; C01F17/20; C01F17/253; C01F17/265; C01F5/00; C01F5/26; C01F5/28; C01G; C01G1/00; C01G1/06; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A METHOD OF PREPARING PURIFIED CRYSTALS FROM A MEMBER OF THE GROUP CONSISTING OF ALKALINE EARTH METAL RARE EARTH METAL, AND MAGNESIUM FLUORIDES AND MIXTURES THEREOF, INITIALLY CONTAINING A SMALL AMOUNT OF AN IMPURITY NORMALLY ASSOCIATED THEREWITH, WHICH COMPRISES: HEATING SAID MEMBER AT REDUCED PRESSURE TO A TEMPERATURE AND FOR A PERIOD OF TIME SUFFICIENT TO PROVIDE A MOLTEN MASS AND AN ASSOCIATED VAPOR PHASE FORMED FROM SAID MEMBER; CONTACTING SAID MEMBER IN SAID VAPOR PHASE WITH A SCAVENGER ALSO IN THE VAPOR PHASE, SAID SCAVENGER BEING SELECTED FROM A GROUP CONSISTING OF MANGANESE TRIFLUORIDE, COBALT TRIFLUORIDE, AND MIXTURES THEREROF; SLOWLY MOVING THE MOLTEN MASS AT A CONTROLLED RATE FROM A REGION HOTTER THAN ITS SOLIDIFICATION TEMPERATURE TO A REGION COOLER THAN SAID TEMPERATURE AND MAINTAINING A TEMPERATURE GRADIENT BETWEEN SAID REGIONS NEAR THE BOUNDARY OF SAID MASS; THEREBY CRYSTALLIZING SAID MEMBER FREE FROM SAID IMPURITY AND IN A SUBSTANTIALLY COLORLESS CONDITION.
Claim 2
Independent Claim
152 words
A METHOD OF PREPARING PURIFIED CRYSTALS FROM A MEMBER OF THE GROUP CONSISTING OF ALKALINE EARTH METAL RARE EARTH METAL, AND MAGNESIUM FLUORIDES AND MIXTURES THEREOF, INITIALLY CONTAINING A SMALL AMOUNT OF AN IMPURITY NORMALLY ASSOCIATED THEREWITH, WHICH COMPRISES: HEATING SAID MEMBER AT REDUCED PRESSURE TO A TEMPERATURE AND FOR A PERIOD OF TIME SUFFICIENT TO PROVIDE A MOLTEN MASS AND AN ASSOCIATED VAPOR PHASE FORMED FROM SAID MEMBER; CONTACTING SAID MEMBER IN SAID VAPOR PHASE WITH A SCAVENGER ALSO IN THE VAPOR PHASE, SAID SCAVENGER BEING SELECTED FROM A GROUP CONSISTING OF MANGANESE TRIFLUORIDE, COBALT TRIFLUORIDE, AND MIXTURES THEREROF; SLOWLY MOVING THE MOLTEN MASS AT A CONTROLLED RATE FROM A REGION HOTTER THAN ITS SOLIDIFICATION TEMPERATURE TO A REGION COOLER THAN SAID TEMPERATURE AND MAINTAINING A TEMPERATURE GRADIENT BETWEEN SAID REGIONS NEAR THE BOUNDARY OF SAID MASS; THEREBY CRYSTALLIZING SAID MEMBER FREE FROM SAID IMPURITY AND IN A SUBSTANTIALLY COLORLESS CONDITION.
References Cited (Backward Citations)
US2498186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |