D21C 5/025
De-inking
Official title: {De-inking}
D21C5/025 (De-inking) appears on 288 US grants and 125 published applications in this corpus.
Search patents in D21C- Granted patents
- 288
- Published applications
- 125
- Assignees
- 167
- Inventors
- 531
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 8 | 0 |
| 1993 | 16 | 0 |
| 1994 | 23 | 0 |
| 1995 | 20 | 0 |
| 1996 | 15 | 0 |
| 1997 | 26 | 0 |
| 1998 | 23 | 0 |
| 1999 | 14 | 0 |
| 2000 | 8 | 0 |
| 2001 | 7 | 1 |
| 2002 | 5 | 9 |
| 2003 | 3 | 3 |
| 2004 | 2 | 8 |
| 2005 | 0 | 8 |
| 2006 | 4 | 3 |
| 2007 | 4 | 4 |
| 2008 | 1 | 4 |
| 2009 | 0 | 2 |
| 2010 | 3 | 5 |
| 2011 | 3 | 5 |
| 2012 | 7 | 7 |
| 2013 | 4 | 6 |
| 2014 | 3 | 6 |
| 2015 | 3 | 7 |
| 2016 | 4 | 4 |
| 2017 | 3 | 6 |
| 2018 | 4 | 9 |
| 2019 | 2 | 2 |
| 2020 | 9 | 7 |
| 2021 | 3 | 3 |
| 2022 | 4 | 2 |
| 2023 | 4 | 6 |
| 2024 | 4 | 6 |
| 2025 | 4 | 2 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Starch fixation and retention in recycled fiber systems28 Jul 2026US 12,692,654 B2Kemira Oyj
- Hygromorphic composite material16 Jun 2026US 12,655,582 B2Nanyang Technological University
- De-inkable inks with high bio-renewable content7 Oct 2025US 12,435,230 B2Sun Chemical Corporation
- Deinking of printed substrates6 May 2025US 12,291,051 B2Siegwerk Druckfarben AG & Co. KGaA
- Papermaking additive compositions and methods and uses thereof25 Mar 2025US 12,258,708 B2Neozyme International, Inc.
- De-inkable inks with high bio-renewable content14 Aug 2025US 2025/0257230 A1Sun Chemical Corporation
- Heat-sensitive recording material8 May 2025US 2025/0144953 A1Koehler Innovation & Technology GmbH
- Starch fixation and retention in recycled fiber systems14 Nov 2024US 2024/0376668 A1Kemira Oyj
- Recyclable and reusable pollen paper16 May 2024US 2024/0158988 A1Nanyang Technological University
- Hygromorphic composite material9 May 2024US 2024/0150959 A1Nanyang Technological University
Most cited
By later US patents
- Use of polymers in the recycled fiber washing/deinking process92US 5,626,718 ABetz Laboratories, Inc. · 1997
- Production of soft paper products from old newspaper82US 5,582,681 AKimberly-Clark Corporation · 1996
- Production of soft paper products from coarse cellulosic fibers64US 6,074,527 AKimberly-Clark Worldwide, Inc. · 2000
- Paper recycling system and paper recycling method54US 8,882,965 B2Seiko Epson Corporation · 2014
- Production of soft paper products from high and low coarseness fibers52US 5,620,565 AKimberly-Clark Corporation · 1997