B01D 21/2488
Bringing about a partial recirculation of the liquid
Official title: {bringing about a partial recirculation of the liquid, e.g. for introducing chemical aids}
B01D21/2488 (Bringing about a partial recirculation of the liquid) appears on 278 US grants and 148 published applications in this corpus.
Search patents in B01D- Granted patents
- 278
- Published applications
- 148
- Assignees
- 198
- Inventors
- 507
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 5 | 0 |
| 1989 | 8 | 0 |
| 1990 | 8 | 0 |
| 1991 | 7 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 10 | 0 |
| 1998 | 10 | 0 |
| 1999 | 10 | 0 |
| 2000 | 12 | 0 |
| 2001 | 10 | 2 |
| 2002 | 4 | 9 |
| 2003 | 8 | 7 |
| 2004 | 3 | 5 |
| 2005 | 6 | 10 |
| 2006 | 5 | 7 |
| 2007 | 4 | 6 |
| 2008 | 4 | 10 |
| 2009 | 5 | 6 |
| 2010 | 3 | 6 |
| 2011 | 2 | 7 |
| 2012 | 9 | 4 |
| 2013 | 2 | 4 |
| 2014 | 7 | 7 |
| 2015 | 4 | 9 |
| 2016 | 6 | 4 |
| 2017 | 4 | 7 |
| 2018 | 6 | 6 |
| 2019 | 2 | 4 |
| 2020 | 8 | 11 |
| 2021 | 5 | 4 |
| 2022 | 7 | 2 |
| 2023 | 5 | 3 |
| 2024 | 7 | 5 |
| 2025 | 2 | 3 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Paint sludge separator tank using froth floatation14 Jul 2026US 12,678,715 B2Giffin, Inc.
- Separator system and method19 May 2026US 12,631,076 B2
- Neutralization/water separation tank for esterified product and neutralization/water separation method for esterified product24 Jun 2025US 12,337,262 B2LG Chem.Ltd.
- Continuous recirculation for separation of fluids produced during drill out and flow back29 Apr 2025US 12,286,847 B2
- Separator system and method24 Dec 2024US 12,173,567 B2
- Neutralization/water separation tank for esterified product and neutralization/water separation method for esterified product14 Aug 2025US 2025/0256221 A1LG Chem.Ltd.
- System and method for removing contaminants from a pyrolysis fluid27 Mar 2025US 2025/0099878 A1Plastic Energy Limited
- Continuous recirculation for separation of fluids produced during drill out and flow back20 Feb 2025US 2025/0059840 A1Cp Energy Services, LLC
- Continuous recirculation for separation of fluids produced during drill out and flow back21 Nov 2024US 2024/0384613 A1Cp Energy Services, LLC
- Method For Combined Hydrocracking of Heavy Petroleum Feedstock, Comprising The Separation of a Spent Additive From Unconverted Hydrocracking Residue and Its Drying3 Oct 2024US 2024/0325945 A1TAIF Joint-Stock Company
Most cited
By later US patents
- Enhanced yield platelet collection systems and methods216US 5,370,802 ABaxter International Inc. · 1994
- Apparatus and method for removing fine particles from a liquid medium by ultrasonic waves175US 4,055,491 A1977
- Apparatus and method for separating blood components123US 4,424,132 AAsahi Kasei Kogyo Kabushiki Kaisha · 1984
- Waste treatment system having integral intrachannel clarifier111US 4,446,018 AArmco Inc. · 1984
- Process and apparatus for the chemical-mechanical treatment and purification of ground waters, surface waters and effluents69US 4,388,195 APassavant-Werke Michelbacher Hutte · 1983