B01D 21/2461
Positive-displacement pumps
Official title: {Positive-displacement pumps; Screw feeders; Trough conveyors}
B01D21/2461 (Positive-displacement pumps) appears on 201 US grants and 154 published applications in this corpus.
Search patents in B01D- Granted patents
- 201
- Published applications
- 154
- Assignees
- 133
- Inventors
- 361
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 8 | 0 |
| 1996 | 7 | 0 |
| 1997 | 7 | 0 |
| 1998 | 6 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 6 | 5 |
| 2003 | 3 | 3 |
| 2004 | 5 | 5 |
| 2005 | 2 | 10 |
| 2006 | 4 | 8 |
| 2007 | 3 | 7 |
| 2008 | 6 | 6 |
| 2009 | 6 | 2 |
| 2010 | 4 | 3 |
| 2011 | 4 | 6 |
| 2012 | 4 | 6 |
| 2013 | 6 | 5 |
| 2014 | 2 | 4 |
| 2015 | 3 | 5 |
| 2016 | 6 | 3 |
| 2017 | 11 | 8 |
| 2018 | 1 | 11 |
| 2019 | 6 | 4 |
| 2020 | 9 | 11 |
| 2021 | 10 | 13 |
| 2022 | 12 | 5 |
| 2023 | 8 | 8 |
| 2024 | 8 | 4 |
| 2025 | 5 | 6 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Separator system and method19 May 2026US 12,631,076 B2
- Separator assemblies and methods28 Apr 2026US 12,611,621 B2Battelle Memorial Institute
- Sand-manure liquid separation plant, a use of the plant, and a method of using the plant24 Feb 2026US 12,558,637 B2Stjernholm A/S
- Waste water management22 Jul 2025US 12,365,600 B2Nouvel Technologies, Inc.
- Neutralization/water separation tank for esterified product and neutralization/water separation method for esterified product24 Jun 2025US 12,337,262 B2LG Chem.Ltd.
- Systems for Grit Removal1 Oct 2026US 2026/0295473 A1
- Mud handling auger system6 Aug 2026US 2026/0225005 A1ESD Waste2Water, Inc.
- Method for digesting bauxite slurry25 Jun 2026US 2026/0176151 A1Zhengzhou Non-Ferrous Metals Research Institute Co. Ltd of Chalco
- Sand-manure liquid separation plant, a use of the plant, and a method of using the plant12 Mar 2026US 2026/0070004 A1Stjernholm A/S
- Concrete recycling system and method of use26 Feb 2026US 2026/0055026 A1
Most cited
By later US patents
- Apparatus and method for separation of solids from liquid82US 5,814,230 A1998
- Assembly for wet cleaning of combustion gases derived from combustion processes, especially the combustion of coal, coke and fuel oil74US 5,468,270 A1995
- Submerged combustion disposal of produced water72US 7,845,314 B22010
- System and method for separating solids from a fluid stream71US 6,506,310 B2DEL Corporation · 2003
- Deep bed thickener/clarifiers with enhanced liquid removal63US 6,758,978 B1GL&V Management Hungary Kft · 2004