D21D 5/18
Purification of the pulp suspension by mechanical means: with the aid of
Official title: with the aid of centrifugal force
D21D5/18 (Purification of the pulp suspension by mechanical means: with the aid of) appears on 180 US grants and 89 published applications in this corpus.
Search patents in D21D- Granted patents
- 180
- Published applications
- 89
- Assignees
- 82
- Inventors
- 234
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 5 | 0 |
| 1980 | 4 | 0 |
| 1981 | 9 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 8 | 0 |
| 1985 | 4 | 0 |
| 1986 | 9 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 7 | 0 |
| 1993 | 8 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 7 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 4 | 4 |
| 2003 | 2 | 1 |
| 2004 | 1 | 4 |
| 2005 | 0 | 3 |
| 2006 | 3 | 5 |
| 2007 | 3 | 3 |
| 2008 | 3 | 3 |
| 2009 | 0 | 2 |
| 2010 | 4 | 2 |
| 2011 | 2 | 2 |
| 2012 | 4 | 2 |
| 2013 | 1 | 1 |
| 2014 | 2 | 4 |
| 2015 | 2 | 8 |
| 2016 | 6 | 6 |
| 2017 | 6 | 6 |
| 2018 | 4 | 4 |
| 2019 | 5 | 4 |
| 2020 | 1 | 4 |
| 2021 | 4 | 4 |
| 2022 | 5 | 1 |
| 2023 | 3 | 6 |
| 2024 | 1 | 5 |
| 2025 | 1 | 2 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Dispersion device and accumulation device26 May 2026US 12,637,807 B2Seiko Epson Corporation
- Method and apparatus for treating mixtures of liquids and solids19 May 2026US 12,630,976 B2Lean Pulp Oy
- Methods for producing pulp and paper products from plants having bast and hurd fibers3 Mar 2026US 12,565,735 B2Goldcup 33965 AB (Unc. Hejmas Agrifibre Technologies AB)
- Hydro-cyclone system13 Jan 2026US 12,521,735 B2Voith Patent GmbH
- Slurry cleaner systems with cleaner dilution devices and methods of cleaning slurries therewith23 Sep 2025US 12,421,661 B2Kadant Black Clawson LLC
- Methods for producing pulp and paper products from plants having bast and hurd fibers25 Jun 2026US 2026/0176819 A1Goldcup 33965 AB (Unc. Hejmas Agrifibre Technologies AB)
- Systems and methods for monitoring reject streams from fiber processing units5 Feb 2026US 2026/0035859 A1Kadant Black Clawson LLC
- Method for operating a pulper for producing a suspension, in particular a fibrous suspension24 Jul 2025US 2025/0237012 A1Voith Patent GmbH
- Methods for Liberating Trichome Fibers from Portions of a Host Plant6 Mar 2025US 2025/0075428 A1The Procter & Gamble Company
- Sulfonated Lignin-Derived Compounds And Uses Thereof26 Sep 2024US 2024/0318382 A1CMBlu Energy AG
Most cited
By later US patents
- Paper recycling system and paper recycling method54US 8,882,965 B2Seiko Epson Corporation · 2014
- Method and apparatus for centrifugal separation36US 4,378,289 A1983
- Cyclone separator36US 5,653,347 ACyclotech Limited · 1997
- Hydrocyclone removal of sticky contaminants during paper recycling33US 5,131,980 AKamyr, Inc. · 1992
- Hydrocyclone deinking of paper during recycling26US 5,069,751 AKamyr, Inc. · 1991