D21F 1/70
By flotation
Official title: by flotation
D21F1/70 (By flotation) appears on 88 US grants and 27 published applications in this corpus.
Search patents in D21F- Granted patents
- 88
- Published applications
- 27
- Assignees
- 42
- Inventors
- 150
- Latest grant
- 11 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 5 | 4 |
| 2002 | 6 | 3 |
| 2003 | 2 | 3 |
| 2004 | 1 | 6 |
| 2005 | 3 | 1 |
| 2006 | 1 | 5 |
| 2007 | 4 | 0 |
| 2008 | 1 | 1 |
| 2009 | 2 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 2 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for suppressing sedimentation of suspended substance, method for suppressing pitch trouble, and method for detecting sedimentation of suspended substance11 Mar 2025US 12,247,354 B2Kurita Water Industries Ltd.
- Method and arrangement21 Jun 2016US 9,370,779 B2Haarla Oy
- Method for removing solid matter from a fibrous material suspension by means of flotation6 Jan 2015US 8,925,728 B2Voith Patent GmbH
- Process and device for aerating suspensions21 Feb 2012US 8,118,171 B2Andritz Inc.
- Flotation cell injector assembly for use with open or closed flotation deinking modules for recycled paper21 Jul 2009US 7,562,777 B1
- Method for suppressing sedimentation of suspended substance, method for suppressing pitch trouble, and method for detecting sedimentation of suspended substance13 Oct 2022US 2022/0325473 A1Kurita Water Industries Ltd.
- Method and arrangement15 Aug 2013US 2013/0206877 A1Haarla Oy
- Method for removing solid matter from a fibrous material suspension by means of flotation2 May 2013US 2013/0105366 A1Voith Patent GmbH
- Perfected Flotation Cell for Purifying Fibrous Suspensions2 Dec 2010US 2010/0300953 A1Comer S.p.A.
- Process and device for aerating suspensions4 Dec 2008US 2008/0296206 A1Andritz Inc.
Most cited
By later US patents
- Method of and means for hydrodynamic mixing67US 4,861,165 ABeloit Corporation · 1989
- 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
- Process and device for removing printer's ink from a fiber suspension36US 4,214,982 AJ. M. Voith GmbH · 1980
- Injector apparatus having a constriction in a following adjoining mixing pipe35US 4,477,341 AJ. M. Voith GmbH · 1984