D21H 23/34
Knife or blade type coaters
D21H23/34 (Knife or blade type coaters) appears on 146 US grants and 62 published applications in this corpus.
Search patents in D21H- Granted patents
- 146
- Published applications
- 62
- Assignees
- 63
- Inventors
- 244
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 7 | 0 |
| 1990 | 5 | 0 |
| 1991 | 6 | 0 |
| 1992 | 11 | 0 |
| 1993 | 4 | 0 |
| 1994 | 7 | 0 |
| 1995 | 3 | 0 |
| 1996 | 7 | 0 |
| 1997 | 13 | 0 |
| 1998 | 9 | 0 |
| 1999 | 7 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 2 |
| 2002 | 0 | 5 |
| 2003 | 6 | 2 |
| 2004 | 2 | 5 |
| 2005 | 2 | 4 |
| 2006 | 3 | 3 |
| 2007 | 2 | 1 |
| 2008 | 3 | 1 |
| 2009 | 1 | 2 |
| 2010 | 2 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 2 | 2 |
| 2014 | 0 | 1 |
| 2015 | 1 | 2 |
| 2016 | 2 | 3 |
| 2017 | 3 | 3 |
| 2018 | 3 | 5 |
| 2019 | 5 | 4 |
| 2020 | 0 | 1 |
| 2021 | 0 | 3 |
| 2022 | 4 | 2 |
| 2023 | 0 | 5 |
| 2024 | 1 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 2 |
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
- Water-dispersible composite structure and method of producing the same30 Jan 2024US 11,885,072 B2Paptic Oy
- Bio-based polyelectrolyte complex compositions comprising non-water soluble particles13 Dec 2022US 11,525,211 B2Organoclick AB
- Water-dispersible composite structure and method of producing the same29 Nov 2022US 11,512,434 B2Paptic Oy
- Masked coating blade11 Oct 2022US 11,466,407 B2BTG Eclepens S.A.
- 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
- Heat sealable barrier material4 Dec 2025US 2025/0369191 A1Upm-Kymmene Corporation
- Method for producing decorative paper26 Dec 2024US 2024/0426058 A1SWISS KRONO Tec AG
- Nitrocellulose papers and methods of production and use16 Nov 2023US 2023/0366151 A1Merck Patent GmbH
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
- Method and apparatus for applying coating liquid to a moving base37US 4,839,201 AValmet Paper Machinery Inc. · 1989
- Paper coating apparatus having a replaceable orifice plate33US 4,440,105 AConsolidated Papers, Inc. · 1984