D21D 5/06
Rotary screen-drums
D21D5/06 (Rotary screen-drums) appears on 60 US grants and 34 published applications in this corpus.
Search patents in D21D- Granted patents
- 60
- Published applications
- 34
- Assignees
- 37
- Inventors
- 94
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 5 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 2 | 0 |
| 2004 | 1 | 2 |
| 2005 | 1 | 0 |
| 2006 | 2 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 3 |
| 2010 | 1 | 0 |
| 2011 | 0 | 2 |
| 2012 | 2 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 1 | 3 |
| 2016 | 1 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 1 |
| 2019 | 0 | 5 |
| 2020 | 2 | 4 |
| 2021 | 5 | 2 |
| 2022 | 3 | 2 |
| 2023 | 2 | 1 |
| 2024 | 1 | 2 |
| 2025 | 1 | 2 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and apparatus for treating mixtures of liquids and solids19 May 2026US 12,630,976 B2Lean Pulp Oy
- Pulp screening machine30 Dec 2025US 12,509,824 B2ANDRITZ (China) Ltd.
- Pressure screen and method for dilution for a pressure screen12 Mar 2024US 11,926,961 B2ANDRITZ (China) Ltd.
- Method and apparatus for controlling a fiber fractionation system5 Dec 2023US 11,834,786 B2International Paper Company
- Powder collection unit and fiber processing apparatus26 Sep 2023US 11,767,637 B2Seiko Epson Corporation
- Systems and methods for monitoring reject streams from fiber processing units5 Feb 2026US 2026/0035859 A1Kadant Black Clawson LLC
- Apparatus for processing fibrous materials18 Sep 2025US 2025/0290251 A1Voith Patent GmbH
- Method for operating a pulper for producing a suspension, in particular a fibrous suspension24 Jul 2025US 2025/0237012 A1Voith Patent GmbH
- Method and apparatus for producing a mouldable cellulosic fibrous material28 Nov 2024US 2024/0392502 A1Papyrus Australia Limited
- Method and apparatus for treating mixtures of liquids and solids23 May 2024US 2024/0167224 A1Lean Pulp Oy
Most cited
By later US patents
- Rotary drum type device for separating solid particles from a liquid59US 5,618,424 ANagaoka International Corporation · 1997
- Screening apparatus for wood pulp21US 5,607,587 A1997
- Screening device20US 3,939,065 A1976
- Sieve apparatus containing a rotatable circular sieve19US 4,306,975 AEscher Wyss Limited · 1981
- Method and device for treating a pulp suspension15US 6,071,378 AKvaerner Pulping AB · 2000