D21H 23/70
Multistep processes
Official title: Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
D21H23/70 (Multistep processes) appears on 113 US grants and 94 published applications in this corpus.
Search patents in D21H- Granted patents
- 113
- Published applications
- 94
- Assignees
- 86
- Inventors
- 279
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 5 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 2 |
| 2002 | 7 | 6 |
| 2003 | 3 | 3 |
| 2004 | 4 | 4 |
| 2005 | 5 | 4 |
| 2006 | 1 | 2 |
| 2007 | 0 | 5 |
| 2008 | 1 | 4 |
| 2009 | 3 | 5 |
| 2010 | 1 | 1 |
| 2011 | 2 | 0 |
| 2012 | 0 | 3 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 2 | 4 |
| 2016 | 3 | 4 |
| 2017 | 5 | 6 |
| 2018 | 4 | 4 |
| 2019 | 4 | 4 |
| 2020 | 1 | 3 |
| 2021 | 1 | 3 |
| 2022 | 4 | 2 |
| 2023 | 2 | 3 |
| 2024 | 1 | 12 |
| 2025 | 1 | 3 |
| 2026 | 4 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for coating a hollow container comprising molded pulp7 Jul 2026US 12,674,284 B2Alpla Werke Alwin Lehner GmbH & Co. KG
- Metalized powder painted color sample16 Jun 2026US 12,654,484 B2Color Communications, Inc.
- Impermeabilization treatment of paper or cardboard and impermeable paper or cardboard thus obtained31 Mar 2026US 12,590,415 B2Qwarzo S.P.A.
- Method for controlling decomposition of corrosion-resistant paper10 Feb 2026US 12,546,063 B2Nippon Beet Sugar Manufacturing Co., Ltd.
- Packaging material for packaging of liquid and food22 Jul 2025US 12,366,039 B2Stora Enso OYJ
- Method for coating a hollow container comprising molded pulp8 Oct 2026US 2026/0308853 A1
- Coating apparatus for coating a hollow container comprising molded pulp1 Oct 2026US 2026/0297855 A1
- Metalized Powder Painted Color Sample10 Sep 2026US 2026/0264445 A1Color Communications, Inc.
- Impermeabilization treatment of paper or cardboard and impermeable paper or cardboard thus obtained6 Aug 2026US 2026/0226687 A1Qwarzo S.P.A.
- Method and composition providing enhanced alcohol barrier for paper packaging applications15 Jan 2026US 2026/0015798 A1Smart Planet Technologies, Inc.
Most cited
By later US patents
- Process for applying chemical papermaking additives to web substrate85US 6,126,784 AThe Procter & Gamble Company · 2000
- Method and apparatus for applying thin fluid coating stripes76US 5,733,608 AMinnesota Mining and Manufacturing Company · 1998
- Twin short dwell coater arrangement39US 4,357,370 ABeloit Corporation · 1982
- Paper wiping products treated with a hydrophobic additive36US 6,896,766 B2Kimberly-Clark Worldwide, Inc. · 2005
- Two sided coater35US 4,354,449 AThe Black Clawson Company · 1982