US3751559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating an aqueous solution of crude sodium chloride
Assignee: Asahi Kasei Corp
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Filing: 1971-06-16
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Granted: 1973-08-07
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Expires: 1991-06-16
Abstract
Abstract A PROCESS FOR TREATING AN AQUEOUS SOLUTION OF CRUDE SODIUM CHLORIDE CONTAINING MERCURY WHEREIN, BEFORE REMOVING MAGNESIUM AND CALCIUM WHICH CONTAMINATE THE CRUDE SODIUM CHLORIDE, CHLORINE OR SODIUM HYPOCHLORITE IS ADDED TO SAID SOLUTION TO CONTROL CONCENTRATION OF FREE CHLORINE THEREIN TO AT LEAST 10 MG./1., THEREBY TO PREVENT MERCURY FROM PRECIPITATING WITH MAGNESIUM AND CALCIUM. IT IS PREFERABLE TO RECYCLE A SLURRY CONTAINING PRECIPITATES OF CALCIUM AND MAGNESIUM.
Inventors
- 👤 I Kanno
- 👤 J Yoshioka
- 👤 S Fuzio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:26
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/14; C01D3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |