Patent US3619133A successfully refreshed from Google Patents.
US3619133A
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Method for preparing sodium ammonium hydrogen phosphate
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1968-11-27
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Granted: 1971-11-09
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Expires: 1988-11-27
Abstract
Abstract This invention relates to a process for producing sodium ammonium hydrogenphosphate (NaNH4HPO4.4H2O) of a high purity and ammonium chloride or an ammonium chloride-containing solution from phosphoric acid, ammonia and sodium chloride or ammonium phosphate and sodium chloride.
Inventors
- 👤 Kozo Fukuba
- 👤 Reiji Matsuda
- 👤 Syozo Fujioka
- 👤 Yasutomo Ogushi
- 👤 Shigeru Nishibara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:00
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45; C01B25/451; C05; C05B; C05B7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
45 words
A process as claimed in claim 1 wherein the mother liquor after the separation of the phosphate crystals is concentrated and ammonium chloride crystals are formed at a temperature higher than the temperature at which sodium ammonium hydrogen phosphate crystallizes, and the crystals are separated.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |