D21C 5/022
Chemicals therefor
Official title: {Chemicals therefor}
D21C5/022 (Chemicals therefor) appears on 109 US grants and 74 published applications in this corpus.
Search patents in D21C- Granted patents
- 109
- Published applications
- 74
- Assignees
- 66
- Inventors
- 212
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 1 | 0 |
| 1998 | 7 | 0 |
| 1999 | 10 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 4 |
| 2002 | 3 | 1 |
| 2003 | 1 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 2 |
| 2013 | 0 | 1 |
| 2014 | 2 | 1 |
| 2015 | 1 | 5 |
| 2016 | 2 | 1 |
| 2017 | 2 | 5 |
| 2018 | 0 | 1 |
| 2019 | 3 | 6 |
| 2020 | 4 | 13 |
| 2021 | 10 | 6 |
| 2022 | 5 | 5 |
| 2023 | 6 | 7 |
| 2024 | 5 | 5 |
| 2025 | 5 | 1 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Starch fixation and retention in recycled fiber systems28 Jul 2026US 12,692,654 B2Kemira Oyj
- Bamboo structures, and methods for fabrication and use thereof20 Jan 2026US 12,529,187 B2University of Maryland, College Park
- Cleaning and depolluting of fibres originating from used cigarette butts by contacting with a supercritical fluid and recycling of the depolluted fibres13 Jan 2026US 12,521,776 B2
- Method for producing recycled pulp fibers, and recycled pulp fibers22 Jul 2025US 12,364,629 B2Unicharm Corporation
- Method for recycling waste aramid-mica composite paper8 Jul 2025US 12,351,982 B2Shaanxi University of Science and Technology
- Recycling of release liner glassine and sck into high quality pulp23 Jul 2026US 2026/0210041 A1Upm-Kymmene Corporation
- Cleaning and depolluting of fibres originating from used cigarette butts by contacting with a supercritical fluid and recycling of the depolluted fibres30 Apr 2026US 2026/0115774 A1
- Bamboo structures, and methods for fabrication and use thereof30 Apr 2026US 2026/0117459 A1University of Maryland, College Park
- Process to produce a functional pre-preg mat from ligno-cellulosic materials15 Jan 2026US 2026/0015795 A1Fiberdom Oy
- Physical reutilization of siliconized papers30 Jan 2025US 2025/0034805 A1Evonik Operations GmbH
Most cited
By later US patents
- Repulpable wet strength paper56US 6,355,137 B1Hercules Incorporated · 2002
- Low-foaming, pH sensitive, alkylamine polyether surface active agents and methods for using36US 4,483,741 AEconomics Laboratory, Inc. · 1984
- Persulfate mixtures for repulping wet strength paper36US 5,972,164 AFMC Corporation · 1999
- Low-foaming, pH sensitive, alkylamine polyether surface active agents and methods for using34US 4,605,773 ADiamond Shamrock Chemicals Company · 1986
- Polyester for the paper industry30US 9,809,929 B2Archroma IP GmbH · 2017