D21H 25/02
Chemical or biochemical treatment
Official title: Chemical or biochemical treatment (D21H25/18 takes precedence)
D21H25/02 (Chemical or biochemical treatment) appears on 80 US grants and 87 published applications in this corpus.
Search patents in D21H- Granted patents
- 80
- Published applications
- 87
- Assignees
- 95
- Inventors
- 254
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 7 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 4 |
| 2003 | 1 | 4 |
| 2004 | 3 | 1 |
| 2005 | 1 | 5 |
| 2006 | 0 | 3 |
| 2007 | 1 | 0 |
| 2008 | 2 | 3 |
| 2009 | 0 | 1 |
| 2010 | 1 | 2 |
| 2011 | 1 | 3 |
| 2012 | 0 | 0 |
| 2013 | 2 | 4 |
| 2014 | 2 | 4 |
| 2015 | 1 | 6 |
| 2016 | 1 | 4 |
| 2017 | 5 | 5 |
| 2018 | 5 | 3 |
| 2019 | 3 | 1 |
| 2020 | 5 | 7 |
| 2021 | 4 | 3 |
| 2022 | 3 | 7 |
| 2023 | 2 | 5 |
| 2024 | 3 | 5 |
| 2025 | 5 | 4 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hygromorphic composite material16 Jun 2026US 12,655,582 B2Nanyang Technological University
- Method for obtaining reinforced packaging paper5 May 2026US 12,618,199 B2Consejo Superior De Investigaciones Cientificas (Csic)
- Water dispersible sheet and method to manufacture water dispersible sheet22 Jul 2025US 12,366,037 B2Daio Paper Corporation
- Method of surface chemical functionalization for developing of functional hydrophobic surfaces20 May 2025US 12,305,333 B2City University of Hong Kong
- Ply fibrous product20 May 2025US 12,305,336 B2Essity Hygiene and Health Aktiebolag
- Paper treatment agent, paper using same, and method for improving texture of paper13 Aug 2026US 2026/0234874 A1Miyoshi Oil & Fat Co., Ltd.
- Method for preparing ultraviolet (uv)-degradable and functionalized cellulose paper-based colorimetric sensor, and application thereof29 Jan 2026US 2026/0029350 A1Hunan Agricultural University
- Method for acylating a hydroxylated solid material22 Jan 2026US 2026/0022520 A1
- Coating layer for paper and board using dissolved cellulose11 Sep 2025US 2025/0283277 A1Teknologian tutkimuskeskus VTT Oy
- Antiviral and antibacterial composition and tissue product, and related manufacturing method24 Apr 2025US 2025/0129548 A1Cartiere Carrara S.p.A.
Most cited
By later US patents
- Process for making absorbent tissue paper with high wet strength and low dry strength91US 4,447,294 AThe Procter & Gamble Company · 1984
- Hydrophilic polymer treatment of an activated polymeric material and use thereof72US 6,830,782 B22004
- Porous random fiber composites and a method for preparing same58US 4,775,580 AThe Dow Chemical Company · 1988
- Apparatus for crosslinking individualized cellulose fibers48US 5,437,418 AWeyerhaeuser Company · 1995
- Production of a cellulose-synthetic polymer composite fiber36US 4,378,431 AThe University of N.C. at Chapel Hill · 1983