C01B 25/416
Pure alkali metal polyphosphates from impure starting materials
Official title: {Pure alkali metal polyphosphates from impure starting materials}
C01B25/416 (Pure alkali metal polyphosphates from impure starting materials) appears on 7 US grants and 0 published applications in this corpus.
Search patents in C01B- Granted patents
- 7
- Published applications
- 0
- Assignees
- 6
- Inventors
- 18
- Latest grant
- 27 Feb 1990
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Process for working up dusts which are produced in the electrothermal production of phosphorus27 Feb 1990US 4,904,459 AHoechst Aktiengesellschaft
- Manufacture of sodium tripolyphosphate from wet acid30 Jun 1987US 4,676,963 AFMC Corporation
- Sodium tripolyphosphate manufacture20 May 1986US 4,590,051 AFMC Corporation
- Process for making sodium tripolyphosphate from wet process phosphoric acid17 Feb 1981US 4,251,491 AOlin Corporation
- Preparation of detergent grade sodium tripolyphosphate from wet process phosphoric acid and soda ash24 Jun 1980US 4,209,497 AStauffer Chemical Company
No published applications in this class yet.
Most cited
By later US patents
- Preparation of sodium tripolyphosphate4US 4,146,575 AEuteco S.p.A. · 1979
- Preparation of detergent grade sodium tripolyphosphate from wet process phosphoric acid and soda ash4US 4,209,497 AStauffer Chemical Company · 1980
- Process for working up dusts which are produced in the electrothermal production of phosphorus3US 4,904,459 AHoechst Aktiengesellschaft · 1990
- Process for making sodium tripolyphosphate from wet process phosphoric acid1US 4,251,491 AOlin Corporation · 1981
- Sodium tripolyphosphate manufacture1US 4,590,051 AFMC Corporation · 1986