D21F 1/20
In fourdrinier machines
Official title: in Fourdrinier machines
D21F1/20 (In fourdrinier machines) appears on 34 US grants and 13 published applications in this corpus.
Search patents in D21F- Granted patents
- 34
- Published applications
- 13
- Assignees
- 19
- Inventors
- 41
- Latest grant
- 22 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 2 |
| 2003 | 0 | 0 |
| 2004 | 1 | 3 |
| 2005 | 0 | 0 |
| 2006 | 1 | 1 |
| 2007 | 2 | 2 |
| 2008 | 0 | 0 |
| 2009 | 2 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
| 2023 | 1 | 3 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for manufacturing a film comprising highly refined cellulose fibers22 Jul 2025US 12,366,036 B2Stora Enso OYJ
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same19 Nov 2024US 12,146,264 B2International Paper Company
- Web transportation apparatus and fiber article producing apparatus7 Nov 2023US 11,807,985 B2Seiko Epson Corporation
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same13 Sep 2022US 11,441,268 B2International Paper Company
- Shake mechanism for glass mat production line6 Oct 2009US 7,597,779 B2Building Materials Investment Corporation
- Method for manufacturing a film comprising highly refined cellulose fibers5 Oct 2023US 2023/0313464 A1Stora Enso OYJ
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same10 Aug 2023US 2023/0250582 A1International Paper Company
- Web transportation apparatus and fiber article producing apparatus9 Mar 2023US 2023/0075175 A1Seiko Epson Corporation
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same11 Jul 2019US 2019/0211503 A1International Paper Company
- Drainage foil for use in an installation for producing a paper web with a fabric belt, which can be moved over a multiplicity of drainage foils oriented transversely to its direction of movement28 Feb 2019US 2019/0062995 A1
Most cited
By later US patents
- Method and apparatus for forming paper37US 4,306,934 A1981
- Velocity induced drainage method and unit29US 5,830,322 ASmurfit Carton Y Papel de Mexico · 1998
- Paper forming activity control with lifting variable inertial stimulation blades with limited-vent indented-surfaces28US 5,922,173 AThermo Fibertek Inc. · 1999
- Paper forming activity blade28US 6,030,501 AThermo Fibertek Inc. · 2000
- Velocity induced drainage method and unit25US 5,951,823 ASmurfit Carton Y Papel de Mexico · 1999