D21H 23/16
Addition before or during pulp beating or refining
Official title: Addition before or during pulp beating or refining (disintegrating fibrous raw materials in mills in the presence of chemical agents D21B1/16; methods of beating D21D1/02; methods of refining D21D1/20)
D21H23/16 (Addition before or during pulp beating or refining) appears on 41 US grants and 24 published applications in this corpus.
Search patents in D21H- Granted patents
- 41
- Published applications
- 24
- Assignees
- 30
- Inventors
- 80
- Latest grant
- 4 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 5 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 2 |
| 2004 | 2 | 3 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 2 |
| 2008 | 0 | 1 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 0 | 1 |
| 2016 | 0 | 2 |
| 2017 | 1 | 1 |
| 2018 | 1 | 2 |
| 2019 | 2 | 0 |
| 2020 | 2 | 1 |
| 2021 | 0 | 1 |
| 2022 | 1 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Process for producing paper or board and a product thereof4 Feb 2025US 12,215,463 B2Kemira Oyj
- Method for manufacture of paper or board and paper or board obtained by the method27 Dec 2022US 11,535,985 B2Kemira Oyj
- Method of manufacturing a toilet paper4 Aug 2020US 10,731,299 B2Daio Paper Corporation
- Toilet paper4 Feb 2020US 10,550,521 B2Daio Paper Corporation
- Method for producing paper29 Oct 2019US 10,458,068 B2Kemira Oyj
- A process for producing paper or board and a product thereof24 Mar 2022US 2022/0090319 A1Kemira Oyj
- Method for manufacture of paper or board and paper or board obtained by the method7 Jan 2021US 2021/0002827 A1Kemira Oyj
- Method of manufacturing a toilet paper2 Jan 2020US 2020/0002895 A1Daio Paper Corporation
- Toilet paper4 Oct 2018US 2018/0282948 A1Daio Paper Corporation
- Method for producing paper22 Feb 2018US 2018/0051416 A1Kemira Oyj
Most cited
By later US patents
- Highly loaded fiber-based composite material146US 5,731,080 AInternational Paper Company · 1998
- Discontinuous cellulose fiber treated with plastic polymer and lubricant109US 3,943,079 AMonsanto Company · 1976
- Method for fiber loading a chemical compound109US 5,223,090 AThe United States of America as represented by the Secretary of Agriculture · 1993
- Retention and drainage aid for alkaline fine papermaking process85US 5,126,014 ANalco Chemical Company · 1992
- Lumen-loaded paper pulp, its production and use81US 4,510,020 APulp and Paper Research Institute of Canada · 1985