D21H 23/22
Addition to the formed paper
D21H23/22 (Addition to the formed paper) appears on 1,260 US grants and 1,015 published applications in this corpus.
Search patents in D21H- Granted patents
- 1,260
- Published applications
- 1,015
- Assignees
- 602
- Inventors
- 2,588
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 13 | 0 |
| 1978 | 9 | 0 |
| 1979 | 1 | 0 |
| 1980 | 6 | 0 |
| 1981 | 11 | 0 |
| 1982 | 22 | 0 |
| 1983 | 19 | 0 |
| 1984 | 9 | 0 |
| 1985 | 19 | 0 |
| 1986 | 10 | 0 |
| 1987 | 10 | 0 |
| 1988 | 26 | 0 |
| 1989 | 32 | 0 |
| 1990 | 27 | 0 |
| 1991 | 21 | 0 |
| 1992 | 25 | 0 |
| 1993 | 17 | 0 |
| 1994 | 22 | 0 |
| 1995 | 26 | 0 |
| 1996 | 28 | 0 |
| 1997 | 38 | 0 |
| 1998 | 52 | 0 |
| 1999 | 48 | 0 |
| 2000 | 47 | 0 |
| 2001 | 40 | 12 |
| 2002 | 44 | 30 |
| 2003 | 39 | 54 |
| 2004 | 33 | 72 |
| 2005 | 21 | 68 |
| 2006 | 22 | 43 |
| 2007 | 31 | 33 |
| 2008 | 24 | 53 |
| 2009 | 15 | 35 |
| 2010 | 24 | 33 |
| 2011 | 26 | 35 |
| 2012 | 21 | 27 |
| 2013 | 26 | 40 |
| 2014 | 22 | 43 |
| 2015 | 26 | 32 |
| 2016 | 25 | 50 |
| 2017 | 40 | 36 |
| 2018 | 26 | 37 |
| 2019 | 30 | 36 |
| 2020 | 23 | 47 |
| 2021 | 20 | 25 |
| 2022 | 38 | 38 |
| 2023 | 22 | 43 |
| 2024 | 20 | 49 |
| 2025 | 30 | 23 |
| 2026 | 18 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- D21H 23/52By contacting paper with a device carrying the material357
- D21H 23/32By contacting paper with an excess of material292
- D21H 23/50Spraying or projecting224
- D21H 23/46Pouring or allowing the fluid to flow in a continuous stream on190
- D21H 23/24During paper manufacture178
- D21H 23/70Multistep processes113
- D21H 23/30Pretreatment of the paper64
- D21H 23/66Treating discontinuous paper23
Recent patents
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- Metalized Powder Painted Color Sample10 Sep 2026US 2026/0264445 A1Color Communications, Inc.
- Barrier recycled paperboard and method for manufacturing thereof10 Sep 2026US 2026/0266001 A1WestRock MWV, LLC
- A method for producing a laminate, and a laminate27 Aug 2026US 2026/0250910 A1Stora Enso OYJ
Most cited
By later US patents
- Methods and apparatus for applying adhesives in patterns to an advancing substrate240US 8,186,296 B2The Procter & Gamble Company · 2012
- Soft tissue paper231US 5,059,282 AThe Procter & Gamble Company · 1991
- Multi-ply absorbent wiping product having relatively inextensible center ply bonded to highly extensible outer plies172US 3,953,638 AThe Procter & Gamble Company · 1976
- Process for manufacturing of formed products139US 4,508,595 A1985
- Process for making soft, strong cellulosic sheet and products made thereby136US 4,795,530 AKimberly-Clark Corporation · 1989