D21B 1/345
Pulpers
Official title: {Pulpers}
D21B1/345 (Pulpers) appears on 126 US grants and 85 published applications in this corpus.
Search patents in D21B- Granted patents
- 126
- Published applications
- 85
- Assignees
- 82
- Inventors
- 192
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 8 | 0 |
| 2001 | 4 | 0 |
| 2002 | 1 | 3 |
| 2003 | 3 | 3 |
| 2004 | 2 | 4 |
| 2005 | 2 | 3 |
| 2006 | 1 | 5 |
| 2007 | 3 | 3 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 0 | 3 |
| 2011 | 3 | 1 |
| 2012 | 4 | 4 |
| 2013 | 2 | 6 |
| 2014 | 3 | 2 |
| 2015 | 3 | 1 |
| 2016 | 0 | 6 |
| 2017 | 0 | 1 |
| 2018 | 0 | 4 |
| 2019 | 3 | 4 |
| 2020 | 2 | 7 |
| 2021 | 4 | 3 |
| 2022 | 5 | 4 |
| 2023 | 1 | 1 |
| 2024 | 3 | 6 |
| 2025 | 2 | 6 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Sheet manufacturing apparatus21 Jul 2026US 12,686,969 B2Seiko Epson Corporation
- Method of making fire retardant materials and related products17 Mar 2026US 12,577,732 B2Cleanfiber Inc.
- Deflaking element for pulper10 Mar 2026US 12,571,161 B2Kadant Black Clawson LLC
- Screen plate and pulp screening machine30 Dec 2025US 12,509,823 B2ANDRITZ (China) Ltd.
- Method for recovering fiber from screening reject and fine sorting pre-processing device for use in method for recovering fiber8 Apr 2025US 12,270,150 B2Taizen Co., Ltd.
- 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
- Method for operating a pulper for producing a suspension, in particular a fibrous suspension24 Jul 2025US 2025/0237012 A1Voith Patent GmbH
- Pulper for producing a stock suspension from solid particles and a flowable medium19 Jun 2025US 2025/0198082 A1W. Lange GmbH Engineering & Screening Components
- Method and device for waste paper pulping29 May 2025US 2025/0171956 A1Voith Patent GmbH
Most cited
By later US patents