US3650683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of condensed aluminum phosphates
Assignee: Hoechst AG
•
Filing: 1969-05-09
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Granted: 1972-03-21
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Expires: 1989-05-09
Abstract
Abstract The preparation of condensed aluminum phosphates containing phosphorus pentoxide and aluminum trioxide in a molar ratio within the range of from 1.1 : 1 to 3 : 1 is carried out by reacting water-soluble alkali metal polyphosphates with watersoluble aluminum salts and water and subjecting them to a heat treatment.
Inventors
- 👤 Albert Hloch
- 👤 Nikolaj Medic
- 👤 Rudolf Kohlhaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:54
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
A process as claimed in claim 1, wherein the precipitated product is subjected to a heat treatment for 1 to 3 hours.
Claim 2
Dependent Claim
25 words
A process as claimed in claim 1, wherein the heat treatment is carried out at temperatures within the range of from 400* to 500* C.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein the alkali metal polyphosphate is tetra-sodium pyrophosphate (Na4P2O7), trisodium metaphosphate ((NaPO3)3), hexa-sodium metaphosphate ((NaPO3)6) or hexa-sodium tetraphosphate (Na6P4O13).
References Cited (Backward Citations)
US3401012A
Cited
US3403971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |