US2949412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercury-cell electrolysis of sodium chloride brine
Assignee: Dow Chemical Co
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Filing: 1948-11-24
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Granted: 1960-08-16
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Expires: 1968-11-24
Abstract
No abstract record available.
Inventors
- 👤 Marshall P Neipert
- 👤 Robert D Blue
- 👤 Ralph M Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:21
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN THE ELECTROLYSIS IN A MERCURY CATHODE ELECTROLYTIC CELL AT A TEMPERATURE OF 40* TO 100*C. OF A SUBSTANTIALLY SATURATED SODIUM CHLORIDE BRINE SUBSTANTIALLY SATURATED WITH CALCIUM SULFATE AND CONTAINNG LESS THAN 0.01 GRAM PER LITER OF MAGNESIUM AND FROM 0.1 PART PER MILLION TO 0.01 GRAM PER LITER OF IRON, THE IMPROVEMENT WHICH COMPRISES CIRCULATING THE SAID BRINE THROUGH THE CIRCULATING MAINTAINING HYDROCHLORIC ACID DISSOLVED IN THE CIRCULATING BRINE ENTERING THE CELL IN A PROPORATION TO PRODUCE TO PH VALUE FROM 2 TO 4.5 AND ADDING TO MAINTAIN BOTH SODIUM SULFATE IN SUCH PROPORTION AS TO MAINTAIN BOTH SODIUM SULFATE IN SUCH PROPORTION AS TO MAINTAIN BOTH SODIUM SULGRAMS PER LITER BUT SUFFICIENT TO REPRESS THE SOLUBILITY OF THE CALCIUM SULFATE TO NOT MORE THAN 3 GRAMS PER LITER.
Claim 2
Dependent Claim
130 words
IN THE ELECTROLYSIS IN A MERCURY CATHODE ELECTROLYTIC CELL AT A TEMPERATURE OF 40* TO 100*C. OF A SUBSTANTIALLY SATURATED SODIUM CHLORIDE BRINE SUBSTANTIALLY SATURATED WITH CALCIUM SULFATE AND CONTAINNG LESS THAN 0.01 GRAM PER LITER OF MAGNESIUM AND FROM 0.1 PART PER MILLION TO 0.01 GRAM PER LITER OF IRON, THE IMPROVEMENT WHICH COMPRISES CIRCULATING THE SAID BRINE THROUGH THE CIRCULATING MAINTAINING HYDROCHLORIC ACID DISSOLVED IN THE CIRCULATING BRINE ENTERING THE CELL IN A PROPORATION TO PRODUCE TO PH VALUE FROM 2 TO 4.5 AND ADDING TO MAINTAIN BOTH SODIUM SULFATE IN SUCH PROPORTION AS TO MAINTAIN BOTH SODIUM SULFATE IN SUCH PROPORTION AS TO MAINTAIN BOTH SODIUM SULGRAMS PER LITER BUT SUFFICIENT TO REPRESS THE SOLUBILITY OF THE CALCIUM SULFATE TO NOT MORE THAN 3 GRAMS PER LITER.
References Cited (Backward Citations)
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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) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |