C01B 25/2372
Anionic impurities
Official title: {Anionic impurities, e.g. silica or boron compounds}
C01B25/2372 (Anionic impurities) appears on 15 US grants and 3 published applications in this corpus.
Search patents in C01B- Granted patents
- 15
- Published applications
- 3
- Assignees
- 15
- Inventors
- 22
- Latest grant
- 14 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 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 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Method for purification of at least one aqueous solution of phosphoric acid14 Oct 2025US 12,441,617 B2Prayon
- Method of purifying phosphoric acid29 Jan 2019US 10,189,710 B2Tenova Advanced Technologies Ltd.
- Method for defluorinating wet process phosphoric acid26 Mar 1991US 5,002,744 AIMC Fertilizer, Inc.
- Manufacture of sodium tripolyphosphate from wet acid30 Jun 1987US 4,676,963 AFMC Corporation
- Process and extractant for removing fluorine compounds from aqueous phosphoric acid27 Mar 1984US 4,439,408 AYissum Research Development Company of the Hebrew University of Jerusalem
- Method for purification of at least one aqueous solution of phosphoric acid3 Apr 2025US 2025/0109020 A1Prayon
- Phosphorus Pentoxide Production Methods and Systems with Fluorine Management26 Sep 2019US 2019/0292055 A1JDCPhosphate, Inc.
- Method of purifying phosphoric acid17 Nov 2016US 2016/0332879 A1Bateman Advanced Technologies Ltd.
Most cited
By later US patents
- Method of producing fluoride-free phosphoric acid8US 4,055,626 APennzoil Company · 1977
- Process for removing fluorine compounds from phosphoric acid4US 3,972,982 AMonsanto Company · 1976
- Recovery of fluoride values4US 4,132,765 AE. I. Du Pont de Nemours and Company · 1979
- Process and extractant for removing fluorine compounds from aqueous phosphoric acid4US 4,439,408 AYissum Research Development Company of the Hebrew University of Jerusalem · 1984
- Process for defluorination of commercial phosphoric acid3US 4,026,995 AAtlantic Richfield Company · 1977