D21H 23/30
Pretreatment of the paper
Official title: Pretreatment of the paper (D21H23/70, D21H23/76 take precedence)
D21H23/30 (Pretreatment of the paper) appears on 64 US grants and 61 published applications in this corpus.
Search patents in D21H- Granted patents
- 64
- Published applications
- 61
- Assignees
- 55
- Inventors
- 185
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 0 |
| 2003 | 8 | 5 |
| 2004 | 4 | 14 |
| 2005 | 1 | 7 |
| 2006 | 3 | 4 |
| 2007 | 2 | 3 |
| 2008 | 4 | 1 |
| 2009 | 1 | 4 |
| 2010 | 1 | 1 |
| 2011 | 1 | 1 |
| 2012 | 3 | 2 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 1 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 7 |
| 2021 | 0 | 1 |
| 2022 | 4 | 5 |
| 2023 | 5 | 1 |
| 2024 | 0 | 0 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for producing sheet for heat-insulating foamed paper container23 Dec 2025US 12,503,817 B2Nissin Foods Holdings Co., Ltd.
- Paper-based flexible packaging material with high barrier properties and a process to produce it13 May 2025US 12,297,601 B2Societe des Produits Nestle S. A.
- Compositions and methods for pretreating substrates for the subsequent fixing of vapor phase corrosion inhibitors28 Nov 2023US 11,827,806 B2EXCOR Korrosionsforschung GmbH
- Manufacturing process of intermittent coating release paper14 Nov 2023US 11,814,796 B2Foshan XinFei Hygiene Materials Co., Ltd.
- Smooth and low density paperboard structures and methods for manufacturing the same11 Jul 2023US 11,697,908 B2WestRock MWV, LLC
- In-line application of dispersion barrier22 May 2025US 2025/0163648 A1Brown LLC
- Paper-based flexible packaging material with high barrier properties and a process to produce it20 Apr 2023US 2023/0123531 A1Societe des Produits Nestle S. A.
- Manufacturing process of intermittent coating release paper3 Nov 2022US 2022/0349126 A1Foshan XinFei Hygiene Materials Co., Ltd.
- Environment-friendly straw paper and preparation method thereof, and manufacturing process of paper straw27 Oct 2022US 2022/0338655 A1Leafpak Company USA Inc
- Interlayer material for lithium-sulfur battery, and lithium-sulfur battery13 Oct 2022US 2022/0328837 A1Qilu University of Technology
Most cited
By later US patents
- Three dimensional macroscopic assemblages of randomly oriented carbon fibrils and composites containing same76US 5,691,054 AHyperion Catalysis Int'l., Inc. · 1997
- Method for providing irreversible smoothness in a paper rawstock40US 5,378,497 AWestvaco Corporation · 1995
- Method and apparatus for curtain coating29US 7,101,592 B2Dow Global Technologies LLC · 2006
- Curtain coating apparatus and curtain coating process28US 6,666,165 B2Mitsubishi Paper Mills Limited · 2003
- Process for bonding chemical additives on to substrates containing cellulosic materials and products thereof27US 6,916,402 B2Kimberly-Clark Worldwide, Inc. · 2005