D21H 23/42
Paper being at least partly surrounded by the material on both sides
Official title: Paper being at least partly surrounded by the material on both sides (D21H23/34 takes precedence)
D21H23/42 (Paper being at least partly surrounded by the material on both sides) appears on 38 US grants and 24 published applications in this corpus.
Search patents in D21H- Granted patents
- 38
- Published applications
- 24
- Assignees
- 43
- Inventors
- 114
- Latest grant
- 20 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 7 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 2 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 1 | 2 |
| 2021 | 1 | 1 |
| 2022 | 1 | 3 |
| 2023 | 0 | 1 |
| 2024 | 1 | 3 |
| 2025 | 1 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Conductive carbon paper and preparation method and use thereof20 May 2025US 12,308,442 B1CAS Linkfiber New Materials (Changzhou) Co., LTD
- Hot-press gas grafting hydrophobization apparatus, and eco-friendly oil-absorbing low- weight paper manufactured using same20 Feb 2024US 11,905,664 B2Daehan Paper Co., Ltd.
- Polymer coated paperboard container and method17 May 2022US 11,332,281 B2Altria Client Services LLC
- Method for producing paper impregnated by a supercritical-pressure fluid, and impregnated, particularly coloured paper17 Aug 2021US 11,091,878 B2Arjo Wiggins Fine Papers Limited
- Polymer coated paperboard container and method31 Mar 2020US 10,604,302 B2Altria Client Services LLC
- Wet strength improved fibrous non-woven fabrics, in particular paper, uses of these wet strength fabrics as well as production methods of the same8 Jan 2026US 2026/0009172 A1Technische Universität Darmstadt
- A fluorochemical-free grease-barrier paper22 May 2025US 2025/0163645 A1Billerud Aktiebolag (publ)
- Gas barrier laminate and packaging17 Oct 2024US 2024/0344273 A1Toppan Inc.
- Processing conventional papers and pulps into hydrophobic and water-resistant packaging materials and tableware25 Jul 2024US 2024/0247442 A1Mississippi State University
- Curtain coater for applying a treatment substance on at least on applicator roll1 Feb 2024US 2024/0033768 A1Andritz Kusters GmbH
Most cited
By later US patents
- Twin short dwell coater arrangement39US 4,357,370 ABeloit Corporation · 1982
- Two sided coater35US 4,354,449 AThe Black Clawson Company · 1982
- Enzyme-treated paper34US 3,966,543 ABaxter Laboratories, Inc. · 1976
- High speed size press28US 4,340,623 ABeloit Corporation · 1982
- Applying a fluoropolymer film to a body27US 5,773,098 ABritish Technology Group Limited · 1998