B01D 21/305
Control of chemical properties of a component
Official title: {Control of chemical properties of a component, e.g. control of pH}
B01D21/305 (Control of chemical properties of a component) appears on 84 US grants and 58 published applications in this corpus.
Search patents in B01D- Granted patents
- 84
- Published applications
- 58
- Assignees
- 71
- Inventors
- 161
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 2 |
| 2002 | 2 | 1 |
| 2003 | 2 | 2 |
| 2004 | 3 | 4 |
| 2005 | 1 | 1 |
| 2006 | 5 | 1 |
| 2007 | 1 | 6 |
| 2008 | 0 | 3 |
| 2009 | 1 | 0 |
| 2010 | 1 | 3 |
| 2011 | 2 | 4 |
| 2012 | 2 | 2 |
| 2013 | 2 | 4 |
| 2014 | 3 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 3 |
| 2017 | 0 | 1 |
| 2018 | 1 | 3 |
| 2019 | 3 | 5 |
| 2020 | 2 | 2 |
| 2021 | 2 | 2 |
| 2022 | 2 | 1 |
| 2023 | 4 | 1 |
| 2024 | 0 | 2 |
| 2025 | 0 | 2 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Device and method for treating green liquor11 Aug 2026US 12,703,943 B2Valmet Corporation
- Systems and methods for fluid monitoring and content control in industrial fluid systems7 Jul 2026US 12,673,276 B2
- Portable particulate filtering system and method31 Oct 2023US 11,801,458 B2Pristine Environmental, LLC
- Fluid treatment system and method30 May 2023US 11,661,359 B2CWC Clear Water Clarification Technologies Inc.
- System and method of solids conditioning in a filtration system18 Apr 2023US 11,629,066 B2Aqua-Aerobic Systems, Inc.
- Brine mineral precipitation extraction6 Aug 2026US 2026/0225006 A1NetZeroImpact LLC
- Systems And Methods For Fluid Monitoring And Content Control In Industrial Fluid Systems5 Mar 2026US 2026/0061341 A1
- Wastewater treatment system and methods utilizing chemical pre-treatment and foam fractionation28 Aug 2025US 2025/0270114 A1Aqua-Terra Consultants
- Systems And Methods For Fluid Monitoring And Content Control In Industrial Fluid Systems6 Mar 2025US 2025/0073618 A1
- System for clarifying process water in oil and gas operations7 Nov 2024US 2024/0367073 A1Redhawk Coil Tubing
Most cited
By later US patents
- Method and apparatus for treatment of wastewater employing membrane bioreactors92US 6,805,806 B2Hydrotreat, Inc. · 2004
- 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
- Jet pump treatment of heavy oil production sand46US 6,527,960 B1Canadian Environmental Equipment & Engineering Technologies, Inc. · 2003
- Reserve pit waste treatment system40US 4,526,687 AWater & Industrial Waste Laboratories, Inc. · 1985
- Method and apparatus for treating animal waste and wastewater34US 7,005,068 B2Hoffland Environmental, Inc. · 2006