D21B 1/16
In the presence of chemical agents
Official title: in the presence of chemical agents
D21B1/16 (In the presence of chemical agents) appears on 104 US grants and 81 published applications in this corpus.
Search patents in D21B- Granted patents
- 104
- Published applications
- 81
- Assignees
- 78
- Inventors
- 239
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 6 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 5 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 2 |
| 2002 | 1 | 0 |
| 2003 | 1 | 2 |
| 2004 | 0 | 7 |
| 2005 | 2 | 6 |
| 2006 | 2 | 3 |
| 2007 | 2 | 7 |
| 2008 | 2 | 6 |
| 2009 | 3 | 6 |
| 2010 | 7 | 7 |
| 2011 | 6 | 2 |
| 2012 | 4 | 3 |
| 2013 | 1 | 4 |
| 2014 | 4 | 4 |
| 2015 | 4 | 1 |
| 2016 | 1 | 2 |
| 2017 | 1 | 0 |
| 2018 | 1 | 3 |
| 2019 | 2 | 4 |
| 2020 | 1 | 1 |
| 2021 | 5 | 3 |
| 2022 | 1 | 1 |
| 2023 | 2 | 0 |
| 2024 | 1 | 2 |
| 2025 | 0 | 1 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method of making fire retardant materials and related products17 Mar 2026US 12,577,732 B2Cleanfiber Inc.
- Method for producing softwood-derived pulp fibers for paper and softwood-derived pulp fibers for paper23 Jan 2024US 11,879,210 B2Unicharm Corporation
- Method of increasing the throughput and/or decreasing energy usage of a pulping process11 Apr 2023US 11,624,153 B2BASF SE
- Method for preparing unbleached biomechanical pulp from straw11 Apr 2023US 11,624,154 B2Qilu University of Technology
- Method for dissolving lignocellulosic biomass8 Nov 2022US 11,492,737 B1United Arab Emirates University
- Preparation of Maple Wood for CTMP Production30 Jul 2026US 2026/0218448 A1Billerud Aktiebolag (publ)
- Maple HT-CTMP30 Jul 2026US 2026/0218449 A1Billerud Aktiebolag (publ)
- HT-CTMP Formed from a Maple Wood/Softwood Mixture30 Jul 2026US 2026/0218453 A1Billerud Aktiebolag (publ)
- Two-step impregnation in ht-ctmp production23 Jul 2026US 2026/0210040 A1Billerud Aktiebolag (publ)
- A method, uses of the same, a pulp composition, and a system23 Jan 2025US 2025/0027270 A1Metsä Board Oyj
Most cited
By later US patents
- Method and apparatus for mixing chemicals into fiber pulp48US 4,908,101 AHedemora AB · 1990
- Treating pulp with oxygen41US 4,295,925 AWeyerhaeuser Company · 1981
- Method for producing pulp using pre-treatment with stabilizers and refining40US 5,002,635 AScott Paper Company · 1991
- Method of producing peroxide bleached pulp38US 4,270,976 ADefibrator AB · 1981
- Refining process for paper pulp using a silica sol36US 5,225,041 ASociete Francaise Hoechst · 1993