C02F 1/542
Phosphorus compounds
Official title: {Phosphorus compounds}
C02F1/542 (Phosphorus compounds) appears on 13 US grants and 14 published applications in this corpus.
Search patents in C02F- Granted patents
- 13
- Published applications
- 14
- Assignees
- 14
- Inventors
- 39
- Latest grant
- 11 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 2 |
| 2004 | 0 | 2 |
| 2005 | 2 | 1 |
| 2006 | 1 | 1 |
| 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 | 1 |
| 2016 | 1 | 1 |
| 2017 | 1 | 3 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Flocculant for treating fracturing flowback fluid and preparation method therefor11 Nov 2025US 12,466,749 B1Shineon Environments Technology Services Co., Ltd.
- Use of polyelectrolytes for the remediation of solids from oil field separation4 Aug 2020US 10,731,087 B2Ecolab USA Inc.
- Water purification3 Dec 2019US 10,494,270 B2Winner Water Services, Inc.
- Reversible microcapsule filter cake23 May 2017US 9,656,233 B2Encapsys, LLC
- Method for regenerating plating solution2 Feb 2016US 9,249,511 B2Fuji Shoji Co., Ltd.
- Amphoteric surfactants for injectivity enhancement in saltwater disposal wells22 Jan 2026US 2026/0022042 A1Chemtreat, Inc.
- Flocculant for treating fracturing flowback fluid and preparation method therefor13 Nov 2025US 2025/0346509 A1Shineon Environments Technology Services Co., Ltd.
- Ammonia Removal in Contaminated Liquid and Gas Streams15 Jun 2023US 2023/0182068 A1
- Use of polyelectrolytes for the remediation of solids from oil field separation7 Sep 2017US 2017/0253813 A1Ecolab USA Inc.
- Water purification27 Jul 2017US 2017/0210639 A1Winner Water Services, Inc.
Most cited
By later US patents
- Method of water treatment using polyacrylamide-phosphonate flocculants11US 5,393,436 ADiatec Polymers · 1995
- Water-soluble allylphosphonate copolymers6US 5,091,491 AW. R. Grace & Co.-Conn. · 1992
- Dephosphorizing material and method of dephosphorization5US 5,518,631 AHazama Corporation · 1996
- Polyacrylamide-phosphonate flocculants and methods of making2US 5,342,539 ADiatec Polymers · 1994
- Polymeric phosphoramides1US 4,048,264 APetrolite Corporation · 1977