C01B 25/24
Condensed phosphoric acids
C01B25/24 (Condensed phosphoric acids) appears on 28 US grants and 7 published applications in this corpus.
Search patents in C01B- Granted patents
- 28
- Published applications
- 7
- Assignees
- 20
- Inventors
- 57
- Latest grant
- 2 Nov 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 2 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 0 |
| 2021 | 1 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for producing polyphosphoric acid and device for such a method2 Nov 2021US 11,161,741 B2Prayon
- Hydrogen sulfide scavengers for polymer treated asphalt28 Jan 2020US 10,544,282 B2Ecolab USA Inc.
- Method and device for producing polyphosphoric acid28 Nov 2017US 9,828,471 B2Prayon Technologies
- Membranes, azeotropic and catalytic components15 Aug 2017US 9,731,969 B2Caloritum NV
- Method and device for producing polyphosphoric acid30 Sep 2014US 8,845,990 B2Prayon Technologies
- Method for recycling residual solutions comprising phosphorus and device for such a method6 May 2021US 2021/0130171 A1Prayon
- Method for producing polyphosphoric acid and device for such a method14 Jan 2021US 2021/0009419 A1Prayon
- Hydrogen sulfide scavengers for polymer treated asphalt14 Jun 2018US 2018/0163021 A1Ecolab USA Inc.
- Membranes, azeotropic & catalytic components13 Aug 2015US 2015/0225240 A1Technology for Renewable Energy Systems (TFRES) BVBA
- Method and Device for Producing Polyphosphoric Acid25 Dec 2014US 2014/0377138 A1Prayon Technologies
Most cited
By later US patents
- Monoalkyl phosphonic acid ester production process47US 5,554,781 A1996
- In-situ phosphation reagent process28US 5,550,274 A1996
- Method of preparing ultraphosphoric acid16US 4,309,394 AMonsanto Company · 1982
- Phosphation reagent13US 6,136,221 ARhodia Inc. · 2000
- Purification of wet process phosphoric acid11US 4,215,098 AAlbright & Wilson Limited · 1980