D21F 3/02
Wet presses
D21F3/02 (Wet presses) appears on 1,245 US grants and 738 published applications in this corpus.
Search patents in D21F- Granted patents
- 1,245
- Published applications
- 738
- Assignees
- 248
- Inventors
- 1,384
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 9 | 0 |
| 1978 | 13 | 0 |
| 1979 | 7 | 0 |
| 1980 | 16 | 0 |
| 1981 | 9 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 13 | 0 |
| 1985 | 24 | 0 |
| 1986 | 13 | 0 |
| 1987 | 25 | 0 |
| 1988 | 16 | 0 |
| 1989 | 27 | 0 |
| 1990 | 44 | 0 |
| 1991 | 21 | 0 |
| 1992 | 48 | 0 |
| 1993 | 25 | 0 |
| 1994 | 24 | 0 |
| 1995 | 32 | 0 |
| 1996 | 32 | 0 |
| 1997 | 40 | 0 |
| 1998 | 42 | 0 |
| 1999 | 46 | 0 |
| 2000 | 37 | 0 |
| 2001 | 51 | 14 |
| 2002 | 66 | 53 |
| 2003 | 46 | 55 |
| 2004 | 32 | 54 |
| 2005 | 28 | 43 |
| 2006 | 33 | 31 |
| 2007 | 23 | 55 |
| 2008 | 19 | 20 |
| 2009 | 30 | 22 |
| 2010 | 28 | 43 |
| 2011 | 30 | 15 |
| 2012 | 24 | 18 |
| 2013 | 19 | 16 |
| 2014 | 14 | 24 |
| 2015 | 14 | 33 |
| 2016 | 19 | 26 |
| 2017 | 23 | 21 |
| 2018 | 14 | 13 |
| 2019 | 16 | 17 |
| 2020 | 19 | 20 |
| 2021 | 18 | 36 |
| 2022 | 22 | 31 |
| 2023 | 25 | 23 |
| 2024 | 22 | 31 |
| 2025 | 14 | 12 |
| 2026 | 12 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- D21F 3/0209With extended press nip554
- D21F 3/04Arrangements thereof305
- D21F 3/08Pressure rolls199
- D21F 3/10Suction rolls155
- D21F 3/0281In combination with a dryer roll124
- D21F 3/0272In combination with suction or blowing devices99
- D21F 3/06Means for regulating the pressure61
- D21F 3/029Using special water-receiving belts30
Recent patents
- Adjusting rolls22 Sep 2026US 12,742,289 B2Voith Patent GmbH
- Papermaking machine with press section11 Aug 2026US 12,703,944 B2Structured I, LLC
- Belt4 Aug 2026US 12,698,593 B2Valmet Technologies Oy
- Fibrous structures4 Aug 2026US 12,698,594 B2The Procter & Gamble Company
- Sheet manufacturing apparatus21 Jul 2026US 12,686,972 B2Seiko Epson Corporation
- Ceiling basemat water reduction through strategic use of pressing and vacuuming17 Sep 2026US 2026/0275636 A1USG Interiors, Inc.
- Belt for pulp or paper machine with sensors for detecting pressure during operation and press using same17 Sep 2026US 2026/0275637 A1Andritz Inc.
- Roller with shielding for sensors10 Sep 2026US 2026/0266672 A1Joanneum Research Forschungsgesellschaft mbH
- Water soluble amphoteric emulsion terpolymers, methods of making, and methods of use as retention and dewatering aids30 Jul 2026US 2026/0218455 A1
- Paper producing system23 Jul 2026US 2026/0210045 A1Paper Excellence Canada Holdings Corporation
Most cited
By later US patents
- Method of and apparatus for removing liquid for webs of porous material143US 4,556,450 AThe Procter & Gamble Company · 1985
- Method of making wet pressed tissue paper95US 5,795,440 AThe Procter & Gamble Company · 1998
- Method and apparatus of sheet transfer using a nonporous smooth surfaced belt93US 4,483,745 ABeloit Corporation · 1984
- Transfer belt in a press nip closed draw transfer90US 5,298,124 AAlbany International Corp. · 1994
- Papermaking machine employing an impermeable transfer belt, and associated methods90US 7,811,418 B2Metso Paper Karlstad AB · 2010