B01D 21/2438
Provided with scrapers on the liquid surface for removing floating particles
Official title: {provided with scrapers on the liquid surface for removing floating particles}
B01D21/2438 (Provided with scrapers on the liquid surface for removing floating particles) appears on 99 US grants and 69 published applications in this corpus.
Search patents in B01D- Granted patents
- 99
- Published applications
- 69
- Assignees
- 69
- Inventors
- 158
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 1 | 0 |
| 1996 | 9 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 1 |
| 2003 | 3 | 4 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 1 |
| 2007 | 0 | 3 |
| 2008 | 1 | 0 |
| 2009 | 1 | 2 |
| 2010 | 2 | 4 |
| 2011 | 4 | 1 |
| 2012 | 2 | 4 |
| 2013 | 1 | 2 |
| 2014 | 0 | 2 |
| 2015 | 1 | 1 |
| 2016 | 2 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 5 |
| 2019 | 1 | 2 |
| 2020 | 6 | 4 |
| 2021 | 4 | 11 |
| 2022 | 8 | 4 |
| 2023 | 1 | 4 |
| 2024 | 2 | 7 |
| 2025 | 3 | 3 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Waste water treatment apparatus21 Apr 2026US 12,605,654 B2Environmental Products & Services Co., Inc.
- Roller for chain and scraper assembly3 Feb 2026US 12,539,473 B2Evoqua Water Technologies LLC
- Headrace system13 Jan 2026US 12,522,518 B2Utsunomiya Kogyo Co., Ltd.
- Passive gravity filter cell to reduce velocity and methods of use thereof14 Oct 2025US 12,441,636 B2Robby Galletta Enterprises LLC
- Pallet coating waste recovery system8 Jul 2025US 12,350,695 B2Air and Liquid Systems, Inc.
- Scum removal system in sewage treatment plant30 Jul 2026US 2026/0217571 A1Utsunomiya Kogyo Co., Ltd.
- Pallet coating waste recovery system25 Sep 2025US 2025/0296108 A1Air and Liquid Systems, Inc.
- Removably attachable skimming mechanism10 Apr 2025US 2025/0114800 A1Dhi - Dalbo Holdings, Inc. & Subsidiaries
- Multi-stage washer including a water treatment system27 Feb 2025US 2025/0066232 A1Stolle Machinery Company, LLC
- Shearing device, arrangement and use19 Dec 2024US 2024/0416261 A1Metso Finland Oy
Most cited
By later US patents
- Water clarifying apparatus57US 4,931,175 ALenox Institute for Research, Inc. · 1990
- Sludge traction and desludging system45US 4,514,303 A1985
- Method for effecting gas-liquid contact41US 5,585,005 AApollo Environmental Systems Corp. · 1996
- Automatic grease separating apparatus32US 4,235,726 ABaker-Waldeck Associates · 1980
- Sewage treatment tank and tube settler30US 3,951,817 AJet Aeration Company · 1976