D21C 9/002
By chemical means
Official title: {by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives}
D21C9/002 (By chemical means) appears on 571 US grants and 643 published applications in this corpus.
Search patents in D21C- Granted patents
- 571
- Published applications
- 643
- Assignees
- 303
- Inventors
- 1,335
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 6 | 0 |
| 1982 | 0 | 0 |
| 1983 | 7 | 0 |
| 1984 | 9 | 0 |
| 1985 | 5 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 5 | 0 |
| 1995 | 8 | 0 |
| 1996 | 9 | 0 |
| 1997 | 6 | 0 |
| 1998 | 12 | 0 |
| 1999 | 10 | 0 |
| 2000 | 8 | 0 |
| 2001 | 22 | 4 |
| 2002 | 26 | 38 |
| 2003 | 32 | 43 |
| 2004 | 24 | 30 |
| 2005 | 13 | 33 |
| 2006 | 24 | 21 |
| 2007 | 11 | 16 |
| 2008 | 7 | 22 |
| 2009 | 9 | 10 |
| 2010 | 11 | 13 |
| 2011 | 9 | 19 |
| 2012 | 7 | 14 |
| 2013 | 12 | 27 |
| 2014 | 19 | 33 |
| 2015 | 15 | 33 |
| 2016 | 27 | 27 |
| 2017 | 17 | 34 |
| 2018 | 21 | 31 |
| 2019 | 25 | 33 |
| 2020 | 27 | 37 |
| 2021 | 26 | 31 |
| 2022 | 21 | 29 |
| 2023 | 14 | 20 |
| 2024 | 20 | 13 |
| 2025 | 12 | 22 |
| 2026 | 5 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Moisture/oil resistant composite materials29 Sep 2026US 12,747,536 B2World Centric
- Crystalline cellulose reinforced cement8 Sep 2026US 12,729,158 B2
- Method for reducing amount of bacterial endospores in an aqueous fibre suspension28 Apr 2026US 12,612,736 B2Kemira Oyj
- Method for producing modified cellulose fiber, and modified cellulose fiber21 Apr 2026US 12,606,952 B2Kao Corporation
- Collapsible engagement mechanism13 Jan 2026US 12,522,537 B2
- Process for producing hygienized pulp8 Oct 2026US 2026/0308846 A1Kemira Oyj
- Cellulose-containing compositions, methods for their preparation, and uses comprising them3 Sep 2026US 2026/0258604 A1Renmatix, Inc.
- Process for producing rigid cellulosic product20 Aug 2026US 2026/0243023 A1Honext Material, Sl
- Graft polymerization of cationic monomers into cellulosic fibers for simultaneous sustainable dyeing and finishing9 Jul 2026US 2026/0193834 A1North Carolina State University
- Method for bleaching cellulose pulp formed from recycled textile material9 Jul 2026US 2026/0193838 A1Valmet Corporation
Most cited
By later US patents
- Absorbent structure containing individualized, polycarboxylic acid crosslinked wood pulp cellulose fibers694US 5,137,537 AThe Procter & Gamble Cellulose Company · 1992
- Individualized cellulosic fibers crosslinked with polyacrylic acid polymers185US 5,549,791 AThe Procter & Gamble Company · 1996
- Process for preparing individualized, polycarboxylic acid crosslinked fibers178US 5,190,563 AThe Proctor & Gamble Company · 1993
- Processing biomass176US 7,932,065 B2Xyleco, Inc. · 2011
- Absorbent articles with nits and free-flowing particles154US 6,667,424 B1Kimberly-Clark Worldwide, Inc. · 2003