US3572989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of calcium hypochlorite
Assignee: Nippon Soda Co Ltd
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Filing: 1969-04-07
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Granted: 1971-03-30
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Expires: 1989-04-07
Abstract
Abstract A SOLUTION SATURATED WITH CALCIUM HYPOCHLORITE AND SODIUM CHLORIDE IS ADDED INTO AN AQUEOUS SOLUTION OF SODIUM HYDROXIDE AND THE MIXED AQUEOUS SOLUTION IS CHLORINATED BY CHLORINE GAS. AFTER CHLORINATION OF THE SOLUTION, SODIUM CHLORIDE CRYSTALLIZED IN THE SOULTION IS SEPARATED, AND THEN, CALCIUM HYDROXIDE IS ADDED INTO THE REACTION SOLUTION, THE REACTION SOLUTION IS CHLORINATED AND CRYSTALLINE CALCIUM HYPOCHLORITE IS SEPARATED FROM THE MOTHER LIQUOR AND THE MOTHER LIQUOR IS USED REPEATEDLY FOR A DILUENT OF INITIAL REACTION.
Inventors
- 👤 Seiji Tatara
- 👤 Toshio Mizukami
- 👤 Makoto Nishonomiya
- 👤 Shotaro Kiga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:46
CPC Classifications
C; C01; C01B; C01B11/00; C01B11/04; C01B11/06; C01B11/064
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |