D21C 5/02
Working-up waste paper
Official title: Working-up waste paper (mechanical part D21B1/08, D21B1/32)
D21C5/02 (Working-up waste paper) appears on 694 US grants and 436 published applications in this corpus.
Search patents in D21C- Granted patents
- 694
- Published applications
- 436
- Assignees
- 385
- Inventors
- 1,322
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 7 | 0 |
| 1981 | 6 | 0 |
| 1982 | 10 | 0 |
| 1983 | 10 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 6 | 0 |
| 1987 | 6 | 0 |
| 1988 | 7 | 0 |
| 1989 | 5 | 0 |
| 1990 | 10 | 0 |
| 1991 | 10 | 0 |
| 1992 | 17 | 0 |
| 1993 | 22 | 0 |
| 1994 | 33 | 0 |
| 1995 | 27 | 0 |
| 1996 | 30 | 0 |
| 1997 | 35 | 0 |
| 1998 | 44 | 0 |
| 1999 | 39 | 0 |
| 2000 | 22 | 0 |
| 2001 | 31 | 5 |
| 2002 | 19 | 19 |
| 2003 | 8 | 8 |
| 2004 | 4 | 17 |
| 2005 | 2 | 19 |
| 2006 | 8 | 11 |
| 2007 | 9 | 13 |
| 2008 | 4 | 10 |
| 2009 | 2 | 13 |
| 2010 | 7 | 14 |
| 2011 | 9 | 13 |
| 2012 | 12 | 13 |
| 2013 | 7 | 13 |
| 2014 | 11 | 19 |
| 2015 | 8 | 18 |
| 2016 | 13 | 17 |
| 2017 | 11 | 22 |
| 2018 | 13 | 22 |
| 2019 | 12 | 25 |
| 2020 | 25 | 38 |
| 2021 | 29 | 20 |
| 2022 | 18 | 17 |
| 2023 | 19 | 23 |
| 2024 | 12 | 20 |
| 2025 | 21 | 16 |
| 2026 | 8 | 11 |
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
- Method of controlling enzymatic activities and tools related thereto21 Jul 2026US 12,686,971 B2Kemira Oyj
- Process and system for producing pulp, energy, and bioderivatives from plant-based and recycled materials14 Jul 2026US 12,678,759 B2Circ, LLC
- Hygromorphic composite material16 Jun 2026US 12,655,582 B2Nanyang Technological University
- Process and system for producing pulp, energy, and bioderivatives from plant-based and recycled materials28 Apr 2026US 12,611,644 B2Circ, LLC
- Process and System for Producing Pulp, Energy, and Bioderivatives from Plant-Based and Recycled Materials10 Sep 2026US 2026/0264040 A1Circ, LLC
- An apparatus for recycling paper and cardboard materials3 Sep 2026US 2026/0258603 A1Point of Origin Waste Solutions Limited
- Process for producing rigid cellulosic product20 Aug 2026US 2026/0243023 A1Honext Material, Sl
- Process for producing rigid cellulosic product30 Jul 2026US 2026/0217867 A1Honext Material, Sl
- Recycling of release liner glassine and sck into high quality pulp23 Jul 2026US 2026/0210041 A1Upm-Kymmene Corporation
Most cited
By later US patents
- Process for preparation of cellulose acetate filters for use in paper making108US 5,662,773 AEastman Chemical Company · 1997
- 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
- Alkaline bacillus amylase75US 5,856,164 ANovo Nordisk A/S · 1999
- Insulated bag with handles68US 10,604,304 B2Pratt Retail Specialties, LLC · 2020