D21H 27/16
Pure paper, i.e. paper lacking or having low content of contaminants
Official title: Pure paper, i.e. paper lacking or having low content of contaminants (after-treatment of cellulose pulp D21C9/00)
D21H27/16 (Pure paper, i.e. paper lacking or having low content of contaminants) appears on 14 US grants and 14 published applications in this corpus.
Search patents in D21H- Granted patents
- 14
- Published applications
- 14
- Assignees
- 12
- Inventors
- 35
- Latest grant
- 26 Dec 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 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 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 3 |
| 2004 | 1 | 3 |
| 2005 | 0 | 2 |
| 2006 | 3 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 1 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Gas barrier film for packaging material26 Dec 2023US 11,851,819 B2Stora Enso OYJ
- Heat sealable barrier coatings for paperboard18 Feb 2020US 10,562,659 B2Georgia-Pacific Bleached Board LLC
- Method for the production of heat-sealing barrier paper3 Dec 2019US 10,494,768 B2Munksjö Oyj
- Additive for paper making22 Aug 2006US 7,094,319 B2Ciba Specialty Chemicals Corporation
- Package structure of planographic printing plates and interleaf paper for packaging the same8 Aug 2006US 7,087,360 B2Fuji Photo Film Co., Ltd.
- Recyclable cellulose-based substrate comprising cellulosic fibres and nonfibrous cellulosic material30 Jul 2026US 2026/0217869 A1
- Gas barrier film for packaging material6 Jan 2022US 2022/0002946 A1Stora Enso OYJ
- Heat sealable barrier coatings for paperboard14 Mar 2019US 2019/0077537 A1Georgia-Pacific Bleached Board LLC
- Method for the production of heat-sealing barrier paper27 Jul 2017US 2017/0211236 A1Munksjö Oyj
- Cigarette filter and filter-tipped cigarette30 Sep 2010US 2010/0242977 A1
Most cited
By later US patents
- Process for modifying pulp from recycled newspapers48US 6,296,736 B1Kimberly-Clark Worldwide, Inc. · 2001
- Latex-saturated paper41US 5,895,557 AKimberly-Clark Worldwide, Inc. · 1999
- Pulp and paper products produced from recycled, high lignin content, waste paper18US 5,587,048 AWestvaco Corporation · 1996
- Brown cigarette wrappers9US 4,146,041 APhilip Morris Incorporated · 1979
- Method for producing a blade coated paper from recycled, high lignin content, waste paper9US 5,538,594 AWestvaco Corporation · 1996