C01B 25/412
Preparation from alkali metal orthophosphates
Official title: {Preparation from alkali metal orthophosphates}
C01B25/412 (Preparation from alkali metal orthophosphates) appears on 34 US grants and 0 published applications in this corpus.
Search patents in C01B- Granted patents
- 34
- Published applications
- 0
- Assignees
- 14
- Inventors
- 68
- Latest grant
- 21 Sep 1999
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 6 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Process for producing alkali metal polyphosphates21 Sep 1999US 5,955,047 AAjinomoto Co., Inc.
- Salt compatible sodium tripolyphosphate26 Aug 1997US 5,660,808 AMonsanto Company
- Process for preparing anhydrous polyphosphate mixed alkali metal salts12 Apr 1994US 5,302,363 AMonsanto Company
- Sodium tripolyphosphate composition and method of producing it3 Aug 1993US 5,232,620 AFMC Corporation
- Preparation of phosphates by induction melting9 Jul 1991US 5,030,430 ARhone-Poulenc Chimie
No published applications in this class yet.
Most cited
By later US patents
- Process for making sodium tripolyphosphate16US 4,536,377 AFMC Corporation · 1985
- Production of Phase II sodium tripolyphosphate10US 4,656,019 AFMC Corporation · 1987
- Production of phosphates from alkali-processes phosphate rock9US 4,777,026 A1988
- Spheroidal alkali metal polyphosphates of low apparent density, and process for making them8US 4,717,557 AHoechst Aktiengesellschaft · 1988
- Spheroidal alkali metal polyphosphates of low apparent density, and process for making them8US 4,721,608 AHoechst Aktiengesellschaft · 1988