D21C 9/16
With per compounds
Official title: with per compounds
D21C9/16 (With per compounds) appears on 375 US grants and 356 published applications in this corpus.
Search patents in D21C- Granted patents
- 375
- Published applications
- 356
- Assignees
- 216
- Inventors
- 852
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 8 | 0 |
| 1989 | 4 | 0 |
| 1990 | 4 | 0 |
| 1991 | 8 | 0 |
| 1992 | 6 | 0 |
| 1993 | 5 | 0 |
| 1994 | 8 | 0 |
| 1995 | 11 | 0 |
| 1996 | 11 | 0 |
| 1997 | 16 | 0 |
| 1998 | 8 | 0 |
| 1999 | 11 | 0 |
| 2000 | 17 | 0 |
| 2001 | 9 | 2 |
| 2002 | 8 | 10 |
| 2003 | 10 | 8 |
| 2004 | 7 | 15 |
| 2005 | 3 | 11 |
| 2006 | 3 | 11 |
| 2007 | 4 | 9 |
| 2008 | 3 | 13 |
| 2009 | 1 | 19 |
| 2010 | 3 | 15 |
| 2011 | 13 | 16 |
| 2012 | 14 | 14 |
| 2013 | 14 | 26 |
| 2014 | 21 | 13 |
| 2015 | 7 | 10 |
| 2016 | 6 | 17 |
| 2017 | 7 | 18 |
| 2018 | 14 | 12 |
| 2019 | 6 | 12 |
| 2020 | 14 | 10 |
| 2021 | 11 | 19 |
| 2022 | 7 | 20 |
| 2023 | 13 | 19 |
| 2024 | 15 | 15 |
| 2025 | 18 | 15 |
| 2026 | 7 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Crystalline cellulose reinforced cement8 Sep 2026US 12,729,158 B2
- Method for distributing chemicals in delignification stages of pulp bleaching process1 Sep 2026US 12,723,350 B2Andritz Inc.
- Optimization of chemical consumption in biomass delignification4 Aug 2026US 12,698,589 B2Sixring Inc.
- Approach to biomass delignification28 Jul 2026US 12,692,653 B2Sixring Inc.
- Process and apparatus for producing bleached cellulose24 Feb 2026US 12,559,885 B2Messer Austria GmbH
- Chemical wood pulp with enhanced tensile strength6 Aug 2026US 2026/0226685 A1SöDra SkogsäGarna Ekonomisk FöRening
- Carboxymethylated lysine-based polymer and compositions comprising the same16 Jul 2026US 2026/0201119 A1BASF SE
- Method for bleaching cellulose pulp formed from recycled textile material9 Jul 2026US 2026/0193838 A1Valmet Corporation
- Hemp paper packaging material for foodstuff21 May 2026US 2026/0139435 A1North Carolina State University
- Method and system for recycling textile material30 Apr 2026US 2026/0117462 A1Valmet Corporation
Most cited
By later US patents
- Process for recovery of cellulose141US 5,057,334 AOrt's Inc. · 1991
- Process of pulping and bleaching fibrous plant material with tert-butyl alcohol and tert-butyl peroxide128US 5,252,183 AABB Lummus Crest Inc. · 1993
- Method for the alkaline bleaching of pulp with a peroxyacid based oxygen bleaching species using an agglomerated bleach activator89US 6,569,286 B1Warwick International Group Limited · 2003
- Alkaline peroxide mechanical pulping of non-woody species86US 6,258,207 B1Alberta Research Council · 2001
- Method for using an all solid-state fluorometer in industrial water system applications77US 6,255,118 B1Nalco Chemical Company · 2001