US2684898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distillation of calcium
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1947-12-29
•
Granted: 1954-07-27
•
Expires: 1967-12-29
Abstract
No abstract record available.
Inventors
- 👤 Barton James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:03
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B26/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR THE PURIFICATION OF A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM CONTAINING AN ALKALI METAL OTHER THAN LITHIUM AS IMPURITY WHICH COMPRISES DISTILLING A BATCH OF THE MIXTURE IN TWO STAGES THE FIRST STAGE DISTILLATION BEING CARRIED OUT IN THE PRESENCE OF AN INERT GAS ENCLOSED WITH THE BATCH AT AN ABSOLUTE PRESSURE SUBSTANTIALLY GREATER THAN THE VAPOUR PRESSURE OF CALCIUM OR MAGNESIUM AT THE TEMPERATURE OF DISTILLATION BUT LESS THAN THE VAPOR PRESSURE AT THAT TEMPERATURE OF THE SAID ALKALI METAL SO THAT SUBSTANTIALLY ONLY THE ALKALI METAL IS VAPORISED AND CONDENSED ON A CONDENSING SURFACE AND A SECOND STAGE DISTILLATION BEING CARRIED OUT IN THE ABSENCE OF AN INERT GAS SO THAT SUBSTANTIALLY ONLY THE CALCIUM OR MAGNESIUM DISTILS UNDER ITS OWN VAPOR PRES-
Claim 2
Dependent Claim
132 words
A PROCESS FOR THE PURIFICATION OF A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM CONTAINING AN ALKALI METAL OTHER THAN LITHIUM AS IMPURITY WHICH COMPRISES DISTILLING A BATCH OF THE MIXTURE IN TWO STAGES THE FIRST STAGE DISTILLATION BEING CARRIED OUT IN THE PRESENCE OF AN INERT GAS ENCLOSED WITH THE BATCH AT AN ABSOLUTE PRESSURE SUBSTANTIALLY GREATER THAN THE VAPOUR PRESSURE OF CALCIUM OR MAGNESIUM AT THE TEMPERATURE OF DISTILLATION BUT LESS THAN THE VAPOR PRESSURE AT THAT TEMPERATURE OF THE SAID ALKALI METAL SO THAT SUBSTANTIALLY ONLY THE ALKALI METAL IS VAPORISED AND CONDENSED ON A CONDENSING SURFACE AND A SECOND STAGE DISTILLATION BEING CARRIED OUT IN THE ABSENCE OF AN INERT GAS SO THAT SUBSTANTIALLY ONLY THE CALCIUM OR MAGNESIUM DISTILS UNDER ITS OWN VAPOR PRES-
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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) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |