US3607018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble polyphosphates
Assignee: FERTILIZER INDUSTRIES Inc
•
Filing: 1968-07-02
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Granted: 1971-09-21
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Expires: 1988-07-02
Abstract
Abstract A mixture of alkali metal chloride and a reactive excess of phosphoric acid is heated in finely divided form at a temperature of about 250 to 400* C. for a period of time of about 1 to 100 seconds. The resulting alkali metal polyphosphates are separated from byproduct hydrogen chloride and quickly cooled to a temperature of less than about 80* C. The alkali metal polyphosphates are water-soluble and free of chloride ion and alkali metal metaphosphates.
Inventors
- 👤 William P Moore
- 👤 William C Sierichs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:34
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/06; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/40; C01B25/41; C01B25/412; C01B25/414
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
35 words
A process as claimed in claim 1 wherein the mixture of potassium chloride and phosphoric acid in step (b) is heated to and maintained at a temperature of about 300* C. for about 15 seconds.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |