D21F 9/006
Paper or board consisting of two or more layers
Official title: {paper or board consisting of two or more layers}
D21F9/006 (Paper or board consisting of two or more layers) appears on 113 US grants and 63 published applications in this corpus.
Search patents in D21F- Granted patents
- 113
- Published applications
- 63
- Assignees
- 57
- Inventors
- 223
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 6 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 10 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 5 | 0 |
| 2001 | 5 | 3 |
| 2002 | 7 | 6 |
| 2003 | 5 | 3 |
| 2004 | 4 | 2 |
| 2005 | 0 | 4 |
| 2006 | 0 | 2 |
| 2007 | 1 | 3 |
| 2008 | 0 | 1 |
| 2009 | 2 | 1 |
| 2010 | 0 | 4 |
| 2011 | 4 | 2 |
| 2012 | 3 | 1 |
| 2013 | 2 | 4 |
| 2014 | 2 | 1 |
| 2015 | 1 | 1 |
| 2016 | 2 | 1 |
| 2017 | 0 | 1 |
| 2018 | 1 | 4 |
| 2019 | 3 | 2 |
| 2020 | 1 | 7 |
| 2021 | 3 | 2 |
| 2022 | 5 | 1 |
| 2023 | 0 | 3 |
| 2024 | 3 | 3 |
| 2025 | 2 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Formation detection system and a process of controlling18 Nov 2025US 12,473,690 B2IBS of America
- Multilayer film comprising highly refined cellulose fibers25 Mar 2025US 12,258,711 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
- Formation detection system and a process of controlling5 Mar 2024US 11,920,299 B2IBS of America
- Former of water laid asset that utilizes a structured fabric as the outer wire27 Feb 2024US 11,913,170 B2Structured I, LLC
- Method for production of a multi-ply paperboard16 Jul 2026US 2026/0201652 A1Billerud Aktiebolag (publ)
- 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
- Formation Detection System and a Process of Controlling20 Jun 2024US 2024/0200268 A1IBS of America
- Barrier coatings applied to nanocellulose-coated paper and paperboard23 May 2024US 2024/0167227 A1FiberLean Technologies Limited
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same10 Aug 2023US 2023/0250582 A1International Paper Company
Most cited
By later US patents
- 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
- Methods for forming a fluted composite125US 6,630,054 B1Weyerhaeuser Company · 2003