D21H 23/76
Processes or apparatus for adding material to the pulp or to the
Official title: characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect (D21H17/18, D21H17/70, D21H23/10 take precedence)
D21H23/76 (Processes or apparatus for adding material to the pulp or to the) appears on 124 US grants and 75 published applications in this corpus.
Search patents in D21H- Granted patents
- 124
- Published applications
- 75
- Assignees
- 78
- Inventors
- 330
- Latest grant
- 29 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 5 | 0 |
| 1995 | 0 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 7 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 0 |
| 2002 | 9 | 4 |
| 2003 | 5 | 10 |
| 2004 | 5 | 18 |
| 2005 | 4 | 7 |
| 2006 | 1 | 8 |
| 2007 | 4 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 3 |
| 2010 | 3 | 1 |
| 2011 | 3 | 2 |
| 2012 | 1 | 2 |
| 2013 | 2 | 1 |
| 2014 | 2 | 3 |
| 2015 | 0 | 0 |
| 2016 | 1 | 2 |
| 2017 | 1 | 2 |
| 2018 | 2 | 2 |
| 2019 | 2 | 0 |
| 2020 | 4 | 4 |
| 2021 | 0 | 1 |
| 2022 | 2 | 2 |
| 2023 | 1 | 0 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- System and method of dynamic corrective enzyme selection and formulation for pulp and paper production29 Apr 2025US 12,286,754 B2Buckman Laboratories International, Inc.
- System and method of dynamic corrective enzyme selection and formulation for pulp and paper production9 Jul 2024US 12,031,273 B2Buckman Laboratories International, Inc.
- Packaging material28 Mar 2023US 11,613,108 B2GPCP IP Holdings LLC
- Method for manufacture of paper or board and paper or board obtained by the method27 Dec 2022US 11,535,985 B2Kemira Oyj
- Method for producing polymer solutions6 Dec 2022US 11,518,695 B2Kemira Oyj
- System and method of dynamic corrective enzyme selection and formulation for pulp and paper production3 Oct 2024US 2024/0328088 A1Buckman Laboratories International, Inc.
- System and method of dynamic corrective enzyme selection and formulation for pulp and paper production16 Jun 2022US 2022/0186441 A1Buckman Laboratories International, Inc.
- Packaging material20 Jan 2022US 2022/0016875 A1GPCP IP Holdings LLC
- Method for manufacture of paper or board and paper or board obtained by the method7 Jan 2021US 2021/0002827 A1Kemira Oyj
- Polymer Probes And Methods10 Dec 2020US 2020/0386736 A1Buckman Laboratories International, Inc.
Most cited
By later US patents
- Papermaking and products made thereby159US 4,388,150 AEKA Aktiebolag · 1983
- Highly filled sheets and method of preparation thereof125US 4,225,383 AThe Dow Chemical Company · 1980
- Production of paper and paper board121US 4,913,775 AAllied Colloids Limited · 1990
- Silica sols having high surface area109US 5,368,833 AEka Nobel AB · 1994
- Composite fiberboard and process of manufacture95US 4,963,603 AArmstrong World Industries, Inc. · 1990