C01B 25/225
Dihydrate process
C01B25/225 (Dihydrate process) appears on 49 US grants and 2 published applications in this corpus.
Search patents in C01B- Granted patents
- 49
- Published applications
- 2
- Assignees
- 28
- Inventors
- 79
- Latest grant
- 11 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 6 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 6 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for removing heavy metals in the manufacture of phosphoric acid11 Feb 2025US 12,221,343 B2Jesa Technologies LLC
- Method for etching a phosphate source using acid9 Aug 2022US 11,407,640 B2Prayon Technologies
- Process waters in phosphate manufacturing22 May 2001US 6,235,257 B1
- Phosphoric acid manufacturing with converted waters31 May 1994US 5,316,748 A
- Removal of aluminum contamination during production of phosphoric acid17 Aug 1993US 5,236,679 AFreeport-McMoRan Resource Partners
Most cited
By later US patents
- Filtration aids for removal of calcium solids from aqueous phosphoric acid23US 4,800,071 ANalco Chemical Company · 1989
- Process for producing wet process phosphoric acid from phosphate rocks containing fluochlorapatite and related minerals16US 4,485,078 AAgrico Chemical Company · 1984
- Process for the treatment of a calcium aluminophosphate15US 4,321,244 AGroupement Franco-Senagalais d'Etudes et de Recherches Industrielles · 1982
- Process of manufacture of phosphoric acid with recovery of co-products14US 4,312,842 A1982
- Continuous process for preparing phosphoric acid and calcium sulphate11US 4,777,027 APrayon Developpment, Societe Anonyme · 1988