D21B 1/325
De-inking devices
Official title: {de-inking devices}
D21B1/325 (De-inking devices) appears on 135 US grants and 54 published applications in this corpus.
Search patents in D21B- Granted patents
- 135
- Published applications
- 54
- Assignees
- 75
- Inventors
- 254
- Latest grant
- 18 Apr 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 6 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 3 | 0 |
| 1993 | 8 | 0 |
| 1994 | 6 | 0 |
| 1995 | 3 | 0 |
| 1996 | 7 | 0 |
| 1997 | 9 | 0 |
| 1998 | 8 | 0 |
| 1999 | 5 | 0 |
| 2000 | 6 | 0 |
| 2001 | 6 | 3 |
| 2002 | 4 | 6 |
| 2003 | 1 | 3 |
| 2004 | 1 | 4 |
| 2005 | 3 | 1 |
| 2006 | 0 | 5 |
| 2007 | 3 | 1 |
| 2008 | 1 | 3 |
| 2009 | 4 | 1 |
| 2010 | 1 | 7 |
| 2011 | 1 | 3 |
| 2012 | 6 | 1 |
| 2013 | 0 | 1 |
| 2014 | 2 | 1 |
| 2015 | 1 | 2 |
| 2016 | 0 | 1 |
| 2017 | 1 | 3 |
| 2018 | 0 | 3 |
| 2019 | 2 | 0 |
| 2020 | 4 | 2 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 2 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Method for treating aqueous feed by dissolved gas flotation18 Apr 2023US 11,629,459 B2Kemira Oyj
- Methods for deinking UV prints24 Jan 2023US 11,560,672 B2Nippon Paper Industries Co., Ltd.
- Froth flotation arrangement and a froth flotation method15 Jun 2021US 11,033,909 B2Outotec (Finland) Oy
- Method and device for cleaning fiber suspensions by means of flotation13 Oct 2020US 10,799,885 B2Rithco Papertec GmbH
- Processing device, sheet manufacturing apparatus, processing method, and sheet manufacturing method22 Sep 2020US 10,781,554 B2Seiko Epson Corporation
- Heat-sensitive recording material8 May 2025US 2025/0144953 A1Koehler Innovation & Technology GmbH
- Method and device for separating printing ink and fiber by dry-process magnetic force difference coupled vibration4 Jan 2024US 2024/0003083 A1
- Methods for deinking uv prints28 Jan 2021US 2021/0025113 A1Nippon Paper Industries Co., Ltd.
- Method for treating aqueous feed by dissolved gas flotation24 Dec 2020US 2020/0399828 A1Kemira Oyj
- A froth flotation arrangement and a froth flotation method30 Apr 2020US 2020/0129992 A1Outotec (Finland) Oy
Most cited
By later US patents
- Method of and means for hydrodynamic mixing67US 4,861,165 ABeloit Corporation · 1989
- Method and apparatus for the generation of ultrasonic energy fields within circular structures containing a liquid40US 6,736,904 B2Paper Quality Management Associates · 2004
- Froth flotation apparatus and method39US 4,399,028 AThe Black Clawson Company · 1983
- Method of and arrangement for the de-inking of pulp suspensions37US 4,331,534 AE & M Lamort · 1982
- Method for producing pulp from printed unselected waste paper37US 4,780,179 A1988