D21H 11/06
Sulfite or bisulfite pulp
D21H11/06 (Sulfite or bisulfite pulp) appears on 34 US grants and 46 published applications in this corpus.
Search patents in D21H- Granted patents
- 34
- Published applications
- 46
- Assignees
- 30
- Inventors
- 88
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 3 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 0 |
| 2014 | 2 | 0 |
| 2015 | 0 | 3 |
| 2016 | 2 | 1 |
| 2017 | 1 | 1 |
| 2018 | 0 | 4 |
| 2019 | 3 | 4 |
| 2020 | 0 | 3 |
| 2021 | 1 | 3 |
| 2022 | 5 | 2 |
| 2023 | 2 | 4 |
| 2024 | 3 | 6 |
| 2025 | 2 | 3 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Corrugated board for humid conditions6 Oct 2026US 12,753,554 B2Billerud Aktiebolag (publ)
- Multi-ply liner with washed NSSC pulp29 Sep 2026US 12,747,539 B2Stora Enso OYJ
- Multi-ply liner for use in corrugated board28 Jul 2026US 12,692,664 B2Stora Enso OYJ
- Multiply containerboard for use in corrugated board10 Feb 2026US 12,546,064 B2Stora Enso OYJ
- Wavelength-controllable cellulose iridescent film and method for preparation thereof20 May 2025US 12,305,011 B2South China University of Technology
- 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)
- Multi-ply liner with washed nssc pulp30 Jul 2026US 2026/0218457 A1Stora Enso OYJ
- Production of ctmp from a hardwood/softwood mixture23 Jul 2026US 2026/0210039 A1Billerud Aktiebolag (publ)
- Grease-repelling paper23 Jul 2026US 2026/0210053 A1Mondi AG
Most cited
By later US patents
- Tissue with strikethrough resistance40US 6,332,952 B1Kimberly-Clark Worldwide, Inc. · 2001
- Creping paper using cationic water soluble addition polymer24US 4,406,737 ARohm and Haas Company · 1983
- Creping paper using cationic water soluble addition20US 4,308,092 ARohm and Haas Company · 1981
- Reactive cationic resins for use as dry and wet strength agents in sulfite ion-containing papermaking systems17US 7,828,934 B2Hercules Incorporated · 2010
- Composition of matter effluent from refiner of a wet laid process11US 11,306,433 B2Eastman Chemical Company · 2022