B01D 21/04
With moving scrapers
Official title: with moving scrapers
B01D21/04 (With moving scrapers) appears on 263 US grants and 139 published applications in this corpus.
Search patents in B01D- Granted patents
- 263
- Published applications
- 139
- Assignees
- 182
- Inventors
- 454
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 10 | 0 |
| 1978 | 13 | 0 |
| 1979 | 10 | 0 |
| 1980 | 11 | 0 |
| 1981 | 11 | 0 |
| 1982 | 5 | 0 |
| 1983 | 6 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 6 | 0 |
| 1991 | 9 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 7 | 0 |
| 1996 | 7 | 0 |
| 1997 | 8 | 0 |
| 1998 | 9 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 2 |
| 2002 | 5 | 2 |
| 2003 | 5 | 7 |
| 2004 | 4 | 9 |
| 2005 | 5 | 7 |
| 2006 | 3 | 4 |
| 2007 | 8 | 11 |
| 2008 | 5 | 3 |
| 2009 | 7 | 6 |
| 2010 | 4 | 5 |
| 2011 | 3 | 9 |
| 2012 | 2 | 2 |
| 2013 | 7 | 10 |
| 2014 | 5 | 6 |
| 2015 | 1 | 10 |
| 2016 | 9 | 1 |
| 2017 | 5 | 6 |
| 2018 | 2 | 7 |
| 2019 | 2 | 0 |
| 2020 | 3 | 9 |
| 2021 | 8 | 4 |
| 2022 | 3 | 1 |
| 2023 | 2 | 4 |
| 2024 | 2 | 5 |
| 2025 | 2 | 4 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Plant and method for recycling and filtering rolling oil1 Sep 2026US 12,722,104 B2Fives Dms
- Headrace system13 Jan 2026US 12,522,518 B2Utsunomiya Kogyo Co., Ltd.
- Wastewater heat exchange system16 Sep 2025US 12,415,149 B2SHARC Energy Systems Inc.
- Equipment for in-situ restoration of sediment15 Jul 2025US 12,356,908 B2
- Clarifier with improved energy dissipating inlet26 Nov 2024US 12,151,186 B2Ovivo Inc.
- System for cleaning equipment intended to be placed in a solid/liquid separation settler, and associated installation and method1 Oct 2026US 2026/0295472 A1Suez International
- Rotary scraper and method for discharging foreign matter having high specific gravity in gypsum slurry13 Aug 2026US 2026/0233127 A1Tokuyama Corporation
- Sludge treatment device18 Jun 2026US 2026/0166591 A1Suido Kiko Kaisha, Ltd.
- High-rate settling clarifier with increased turn down capabilities30 Apr 2026US 2026/0116795 A1Suez International
- Method, apparatus, and system to optimize flocculation of solid particles in a settling vessel26 Mar 2026US 2026/0084080 A1
Most cited
By later US patents
- Apparatus for water purification by culturing and harvesting attached algal communities72US 5,527,456 A1996
- 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
- Deep bed thickener/clarifiers with enhanced liquid removal63US 6,758,978 B1GL&V Management Hungary Kft · 2004
- Thickener control system60US 4,226,714 AThe Anaconda Company · 1980
- Method and installation for treating an untreated flow by simple sedimentation after ballasting with fine sand50US 6,010,631 AOmnium de Traitement et de Valorisation (OTV) · 2000