C01B 25/303
With elimination of impurities
Official title: {with elimination of impurities}
C01B25/303 (With elimination of impurities) appears on 26 US grants and 5 published applications in this corpus.
Search patents in C01B- Granted patents
- 26
- Published applications
- 5
- Assignees
- 14
- Inventors
- 44
- Latest grant
- 25 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 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 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for the high efficiency recycling of iron phosphate black powder slag25 Nov 2025US 12,479,726 B2
- Manufacturing method of high purity lithium phosphate from the waste liquid of the exhausted lithium-ion battery21 Aug 2018US 10,056,656 B2KANGWON NATIONAL UNIVERSITY University-Industry Cooperation Foundation
- Method of producing alkali metal phosphate22 Aug 1995US 5,443,808 AKemira Oy
- Production of monobasic potassium phosphate with low chloride content from potassium chloride and phosphoric acid produced from the commercial wet process5 Dec 1989US 4,885,148 APhosphate Engineering & Construction Co., Inc.
- Process for the manufacture of disodium phosphate26 Jul 1988US 4,759,920 ANegev Phosphates Ltd.
- Method for the high efficiency recycling of iron phosphate black powder slag6 Jun 2024US 2024/0182304 A1Watix Technology LLC
- Process to produce lithium compounds27 Jul 2023US 2023/0234848 A1
- Process for the production of a fertilizer29 Sep 2022US 2022/0306471 A1Nouryon Chemicals International B. V.
- Process for the production of a fertilizer3 Jun 2021US 2021/0163289 A1Nouryon Chemicals International B. V.
- Manufacturing method of high purity lithium phosphate from the waste liquid of the exhausted litium-ion battery23 Mar 2017US 2017/0084965 A1KANGWON NATIONAL UNIVERSITY University-Industry Cooperation Foundation
Most cited
By later US patents
- Removal of fluorine from phosphatic solutions20US 4,053,561 AStauffer Chemical Company · 1977
- Manufacturing method of high purity lithium phosphate from the waste liquid of the exhausted lithium-ion battery16US 10,056,656 B2KANGWON NATIONAL UNIVERSITY University-Industry Cooperation Foundation · 2018
- Food grade alkali metal phosphates from wet process H.sub.3 PO.sub.413US 3,993,733 AStauffer Chemical Company · 1976
- Method of producing fluoride-free phosphoric acid8US 4,055,626 APennzoil Company · 1977
- Production of fluoride-free phosphates8US 4,086,322 APennzoil Company · 1978