D21F 9/003
Complete machines for making continuous webs of paper: of the twin-wire type
Official title: {of the twin-wire type}
D21F9/003 (Complete machines for making continuous webs of paper: of the twin-wire type) appears on 423 US grants and 200 published applications in this corpus.
Search patents in D21F- Granted patents
- 423
- Published applications
- 200
- Assignees
- 123
- Inventors
- 613
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 9 | 0 |
| 1978 | 9 | 0 |
| 1979 | 10 | 0 |
| 1980 | 8 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 11 | 0 |
| 1985 | 8 | 0 |
| 1986 | 4 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 10 | 0 |
| 1991 | 9 | 0 |
| 1992 | 10 | 0 |
| 1993 | 13 | 0 |
| 1994 | 6 | 0 |
| 1995 | 14 | 0 |
| 1996 | 20 | 0 |
| 1997 | 20 | 0 |
| 1998 | 20 | 0 |
| 1999 | 6 | 0 |
| 2000 | 9 | 0 |
| 2001 | 20 | 8 |
| 2002 | 20 | 17 |
| 2003 | 11 | 12 |
| 2004 | 8 | 13 |
| 2005 | 7 | 12 |
| 2006 | 11 | 10 |
| 2007 | 3 | 15 |
| 2008 | 5 | 8 |
| 2009 | 10 | 7 |
| 2010 | 8 | 11 |
| 2011 | 11 | 4 |
| 2012 | 7 | 5 |
| 2013 | 8 | 9 |
| 2014 | 4 | 3 |
| 2015 | 2 | 5 |
| 2016 | 5 | 4 |
| 2017 | 2 | 3 |
| 2018 | 2 | 6 |
| 2019 | 6 | 10 |
| 2020 | 4 | 10 |
| 2021 | 11 | 8 |
| 2022 | 6 | 2 |
| 2023 | 6 | 8 |
| 2024 | 6 | 8 |
| 2025 | 4 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for manufacturing a barrier film comprising highly refined cellulose12 May 2026US 12,624,501 B2Stora Enso OYJ
- Formation detection system and a process of controlling18 Nov 2025US 12,473,690 B2IBS of America
- Device and method for producing a fibrous web2 Sep 2025US 12,404,634 B2Voith Patent GmbH
- Multilayer film comprising highly refined cellulose fibers25 Mar 2025US 12,258,711 B2Stora Enso OYJ
- Tissue paper making machine25 Feb 2025US 12,234,606 B2Valmet Aktiebolag
- Method for production of a multi-ply paperboard16 Jul 2026US 2026/0201652 A1Billerud Aktiebolag (publ)
- Continuous papermaking machines and methods for continuous papermaking20 Mar 2025US 2025/0092602 A1
- Barrier layers comprising nanocellulose onto the surface of paper or paperboard substrates at the wet end of a papermaking process24 Oct 2024US 2024/0352675 A1FiberLean Technologies Limited
- Method for manufacturing a barrier film comprising highly refined cellulose11 Jul 2024US 2024/0229358 A9Stora Enso OYJ
- Soft tissue produced using a structured fabric and energy efficient pressing4 Jul 2024US 2024/0218604 A1First Quality Tissue, LLC
Most cited
By later US patents
- Process and apparatus for forming a paper web having improved bulk and absorptive capacity271US 4,102,737 AThe Procter & Gamble Company · 1978
- Extended flexible headbox slice with parallel flexible lip extensions and extended internal dividers194US 5,129,988 AKimberly-Clark Corporation · 1992
- Soft single-ply tissue having very low sideness146US 6,051,104 AFort James Corporation · 2000
- Soft-single ply tissue having very low sidedness139US 5,695,607 AJames River Corporation of Virginia · 1997
- Multiple layer formation process for creped tissue136US 4,166,001 AKimberly-Clark Corporation · 1979