US2882126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process
Assignee: Columbia Southern Chemical Corp
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Filing: 1954-11-18
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Granted: 1959-04-14
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Expires: 1974-11-18
Abstract
No abstract record available.
Inventors
- 👤 Conrad Lawrence Paul
- 👤 Hazel John Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:12
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/20; C01F11/24; C01F11/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN THE METHOD OF TREATING CALCIUM CHLORIDE SOLUTION PREPARED BY THE AMMONIA-SODA PROCESS AND CONTAINING AN IMPRUITY WHICH, UPON CONCENTRATING OF THE CALCIUM CHLORIDE SOLUTION, IMPARTS A DARK COLOR TO THE SOLUTION, THE IMPROVEMENT WHICH COMPRISES CONCENTRATING THE CALCIUM CHLORIDE SOLUTION TO A CONCENTRATION OF NOT LESS THAN 30 PECENT BY WEIGHT, REMOVING SUSPENDED SALTS THEREIN, HEATING THE RESULTING PRODUCT FOR A PERIOD IN EXCESS OF ONE HOUR, AND IN EXCESS OF THE TIME REQUIRED TO CONCENTRATE SUCH SOLUTION TO 55 PERCENT BY WEIGHT, AT A TEMPERATURE ABOVE 50*C. AND UNTIL SUBSTANTIALLY COMPLETE PRECIPITATION OF THE DARK COLORED IMPURITY HAS TAKEN PLACE, AND SEPARATING THE PRECIPITATED IMPURITY FROM THE SOLUTION.
Claim 2
Dependent Claim
110 words
IN THE METHOD OF TREATING CALCIUM CHLORIDE SOLUTION PREPARED BY THE AMMONIA-SODA PROCESS AND CONTAINING AN IMPRUITY WHICH, UPON CONCENTRATING OF THE CALCIUM CHLORIDE SOLUTION, IMPARTS A DARK COLOR TO THE SOLUTION, THE IMPROVEMENT WHICH COMPRISES CONCENTRATING THE CALCIUM CHLORIDE SOLUTION TO A CONCENTRATION OF NOT LESS THAN 30 PECENT BY WEIGHT, REMOVING SUSPENDED SALTS THEREIN, HEATING THE RESULTING PRODUCT FOR A PERIOD IN EXCESS OF ONE HOUR, AND IN EXCESS OF THE TIME REQUIRED TO CONCENTRATE SUCH SOLUTION TO 55 PERCENT BY WEIGHT, AT A TEMPERATURE ABOVE 50*C. AND UNTIL SUBSTANTIALLY COMPLETE PRECIPITATION OF THE DARK COLORED IMPURITY HAS TAKEN PLACE, AND SEPARATING THE PRECIPITATED IMPURITY FROM THE SOLUTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |