D21H 23/32
By contacting paper with an excess of material
Official title: by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper (D21H23/66 takes precedence; removing excess material D21H25/08)
D21H23/32 (By contacting paper with an excess of material) appears on 292 US grants and 110 published applications in this corpus.
Search patents in D21H- Granted patents
- 292
- Published applications
- 110
- Assignees
- 131
- Inventors
- 473
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 10 | 0 |
| 1983 | 8 | 0 |
| 1984 | 5 | 0 |
| 1985 | 7 | 0 |
| 1986 | 6 | 0 |
| 1987 | 6 | 0 |
| 1988 | 10 | 0 |
| 1989 | 19 | 0 |
| 1990 | 13 | 0 |
| 1991 | 9 | 0 |
| 1992 | 13 | 0 |
| 1993 | 4 | 0 |
| 1994 | 8 | 0 |
| 1995 | 3 | 0 |
| 1996 | 8 | 0 |
| 1997 | 14 | 0 |
| 1998 | 17 | 0 |
| 1999 | 16 | 0 |
| 2000 | 16 | 0 |
| 2001 | 13 | 3 |
| 2002 | 9 | 7 |
| 2003 | 10 | 3 |
| 2004 | 4 | 8 |
| 2005 | 3 | 7 |
| 2006 | 5 | 5 |
| 2007 | 4 | 2 |
| 2008 | 3 | 5 |
| 2009 | 1 | 4 |
| 2010 | 3 | 1 |
| 2011 | 1 | 3 |
| 2012 | 0 | 0 |
| 2013 | 2 | 5 |
| 2014 | 0 | 2 |
| 2015 | 2 | 3 |
| 2016 | 2 | 5 |
| 2017 | 3 | 4 |
| 2018 | 3 | 7 |
| 2019 | 6 | 5 |
| 2020 | 2 | 3 |
| 2021 | 1 | 4 |
| 2022 | 5 | 6 |
| 2023 | 0 | 6 |
| 2024 | 4 | 6 |
| 2025 | 1 | 3 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Barrier recycled paperboard and method for manufacturing thereof5 May 2026US 12,618,198 B2WestRock MWV, LLC
- Conductive carbon paper and preparation method and use thereof20 May 2025US 12,308,442 B1CAS Linkfiber New Materials (Changzhou) Co., LTD
- Germ-repellent book and food paper packaging, and method of manufacture8 Oct 2024US 12,110,635 B2Main Choice Paper Products Limited
- Germ-repellent book and food paper packaging, and method of manufacture4 Jun 2024US 12,000,092 B2Main Choice Paper Products Limited
- 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.
- Barrier recycled paperboard and method for manufacturing thereof10 Sep 2026US 2026/0266001 A1WestRock MWV, LLC
- Device, use and method for dosing or levelling9 Jul 2026US 2026/0192323 A1Voith Patent GmbH
- 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
- Heat sealable barrier material4 Dec 2025US 2025/0369191 A1Upm-Kymmene Corporation
- A fluorochemical-free grease-barrier paper22 May 2025US 2025/0163645 A1Billerud Aktiebolag (publ)
Most cited
By later US patents
- Doctor blade for use in coating continuous strips of material or similar substrates88US 5,520,731 AZanders Feinpapiere AG · 1996
- Paper coating method and apparatus65US 4,250,211 AConsolidated Papers, Inc. · 1981
- Doctor blade assembly with rotary end seals and interchangeable heads44US 4,821,672 A1989
- Twin short dwell coater arrangement39US 4,357,370 ABeloit Corporation · 1982
- Paper coating apparatus37US 4,512,279 AConsolidated Papers, Inc. · 1985