D21C 3/022
In presence of s-containing compounds
Official title: {in presence of S-containing compounds}
D21C3/022 (In presence of s-containing compounds) appears on 54 US grants and 59 published applications in this corpus.
Search patents in D21C- Granted patents
- 54
- Published applications
- 59
- Assignees
- 67
- Inventors
- 184
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 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 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 3 |
| 2012 | 1 | 3 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 2 |
| 2016 | 0 | 1 |
| 2017 | 1 | 3 |
| 2018 | 4 | 2 |
| 2019 | 1 | 7 |
| 2020 | 0 | 4 |
| 2021 | 5 | 5 |
| 2022 | 1 | 2 |
| 2023 | 5 | 6 |
| 2024 | 3 | 5 |
| 2025 | 4 | 4 |
| 2026 | 3 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Hemp paper packaging material for foodstuff17 Feb 2026US 12,553,184 B2Wm. Wrigley Jr. Company
- Pulping methods, methods for manufacturing paperboard, and paperboard structures6 Jan 2026US 12,516,472 B2WestRock MWV, LLC
- Evaporative devices having delignified plant materials, and systems and methods for fabrication and use thereof30 Dec 2025US 12,509,822 B2University of Maryland, College Park
- Strong and tough structural wood materials, and methods for fabricating and use thereof29 Apr 2025US 12,285,882 B2University of Maryland, College Park
- 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)
- Production of ctmp from a hardwood/softwood mixture23 Jul 2026US 2026/0210039 A1Billerud Aktiebolag (publ)
- Two-step impregnation in ht-ctmp production23 Jul 2026US 2026/0210040 A1Billerud Aktiebolag (publ)
Most cited
By later US patents
- Process for the production of viscose pulp38US 5,676,795 ALenzing Aktiengesellschaft · 1997
- Production of prehydrolyzed pulp35US 5,589,033 ASunds Defibrator Pori Oy · 1996
- Digester system for implementing low dissolved solids profiling21US 5,536,366 AAhlstrom Machinery Inc. · 1996
- Treatment of cellulose material with additives while producing cellulose pulp20US 6,241,851 B1Andritz-Ahlstrom Inc. · 2001
- Continuous digester with dissolved solids handling19US 5,662,775 AAhlstrom Machinery Inc. · 1997