D21B 1/38
Conserving the finely-divided cellulosic material
D21B1/38 (Conserving the finely-divided cellulosic material) appears on 13 US grants and 9 published applications in this corpus.
Search patents in D21B- Granted patents
- 13
- Published applications
- 9
- Assignees
- 10
- Inventors
- 24
- Latest grant
- 4 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 2 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 2 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Separation of fibers4 Feb 2025US 12,215,459 B2Circulose AB
- Multi-density tissue towel products comprising high-aspect-ratio cellulose filaments28 Jul 2020US 10,724,173 B2Mercer International Inc.
- Low temperature and efficient fractionation of lignocellulosic biomass using recyclable organic solid acids26 Mar 2019US 10,239,905 B2
- Arrangement for and a method of treating pulp, and a method of modernizing a pulp tower24 Nov 2009US 7,622,018 B2Sulzer Pumpen AG
- Floor absorbent granular product comprising kaokin clay and cellulose fibers10 Apr 2001US 6,214,465 B1Marcel Paper Mills, Inc.
- A method for reducing the load of microbial contaminants in a pulp stock comprising a recycled fiber fraction16 Apr 2026US 2026/0103843 A1Stora Enso OYJ
- Separation of fibers2 Mar 2023US 2023/0060430 A1Re:Newcell AB
- Separation of fibers14 Apr 2022US 2022/0112658 A1Re:Newcell AB
- Methods of making specialized cellulose and other products from biomass16 Sep 2021US 2021/0285155 A1Sweetwater Energy, Inc.
- Methods and devices for processing lignocellulosic biomass with recovery purified lignin and purified wax fractions.12 Aug 2021US 2021/0246608 A1
Most cited
By later US patents
- Absorbent granular product16US 5,888,345 AMarcal Paper Mills, Inc. · 1999
- Apparatus for making granular material12US 5,951,822 AMarcal Paper Mills, Inc. · 1999
- Granular material containing recycled paper components8US 5,807,465 AMarcal Paper Mills, Inc. · 1998
- Process for making granular material7US 5,882,480 AMarcal Paper Mills, Inc. · 1999
- Dyed particulate or granular materials from recycled paper and process for making the materials6US 5,622,600 AMarcal Paper Mills, Inc. · 1997