D21B 1/32
Of waste paper
Official title: of waste paper
D21B1/32 (Of waste paper) appears on 405 US grants and 214 published applications in this corpus.
Search patents in D21B- Granted patents
- 405
- Published applications
- 214
- Assignees
- 198
- Inventors
- 660
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 5 | 0 |
| 1980 | 12 | 0 |
| 1981 | 6 | 0 |
| 1982 | 7 | 0 |
| 1983 | 9 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 10 | 0 |
| 1987 | 9 | 0 |
| 1988 | 10 | 0 |
| 1989 | 10 | 0 |
| 1990 | 8 | 0 |
| 1991 | 9 | 0 |
| 1992 | 10 | 0 |
| 1993 | 15 | 0 |
| 1994 | 16 | 0 |
| 1995 | 7 | 0 |
| 1996 | 17 | 0 |
| 1997 | 17 | 0 |
| 1998 | 20 | 0 |
| 1999 | 14 | 0 |
| 2000 | 12 | 0 |
| 2001 | 18 | 5 |
| 2002 | 16 | 13 |
| 2003 | 9 | 9 |
| 2004 | 3 | 15 |
| 2005 | 4 | 9 |
| 2006 | 3 | 11 |
| 2007 | 10 | 8 |
| 2008 | 6 | 12 |
| 2009 | 4 | 6 |
| 2010 | 2 | 13 |
| 2011 | 3 | 9 |
| 2012 | 11 | 8 |
| 2013 | 4 | 3 |
| 2014 | 4 | 3 |
| 2015 | 5 | 5 |
| 2016 | 1 | 11 |
| 2017 | 3 | 9 |
| 2018 | 5 | 8 |
| 2019 | 8 | 8 |
| 2020 | 8 | 16 |
| 2021 | 11 | 3 |
| 2022 | 6 | 6 |
| 2023 | 6 | 4 |
| 2024 | 5 | 8 |
| 2025 | 6 | 8 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Material storage apparatus, method of controlling material storage apparatus, and sheet manufacturing apparatus14 Apr 2026US 12,601,112 B2Seiko Epson Corporation
- Method of making fire retardant materials and related products17 Mar 2026US 12,577,732 B2Cleanfiber Inc.
- Paper stock modification device10 Mar 2026US 12,571,160 B2Taizen Co., Ltd.
- Fibrous body processing apparatus2 Sep 2025US 12,404,633 B2Seiko Epson Corporation
- Ragger systems and methods for removing solid debris from pulping processes17 Jun 2025US 12,331,459 B2Kadant Black Clawson LLC
- Method and device for producing a fibrous web20 Aug 2026US 2026/0243021 A1Andritz Kuesters GmbH
- System and method for handling a ragger formed in a pulper process4 Jun 2026US 2026/0152902 A1
- Systems and methods for monitoring reject streams from fiber processing units5 Feb 2026US 2026/0035859 A1Kadant Black Clawson LLC
- Sheet production apparatus and sheet production method of sheet production apparatus22 Jan 2026US 2026/0022516 A1Seiko Epson Corporation
- Apparatus for processing fibrous materials18 Sep 2025US 2025/0290251 A1Voith Patent GmbH
Most cited
By later US patents
- Method of treating papermaking fibers for making tissue173US 5,348,620 AKimberly-Clark Corporation · 1994
- Method of treating papermaking fibers for making tissue146US 5,501,768 AKimberly-Clark Corporation · 1996
- Method of and means for hydrodynamic mixing67US 4,861,165 ABeloit Corporation · 1989
- Method and apparatus for preparing paper-containing and plastic-containing waste materials for component fraction separation65US 4,974,781 AThe Placzek Family Trust · 1990
- Recycling plastic coated paper product waste58US 5,084,135 AAdvanced Environmental Recycling Technologies, Inc. · 1992