D21C 3/228
Automation of the pulping processes
Official title: {Automation of the pulping processes}
D21C3/228 (Automation of the pulping processes) appears on 33 US grants and 21 published applications in this corpus.
Search patents in D21C- Granted patents
- 33
- Published applications
- 21
- Assignees
- 28
- Inventors
- 76
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 4 | 2 |
| 2003 | 0 | 2 |
| 2004 | 0 | 0 |
| 2005 | 1 | 2 |
| 2006 | 0 | 3 |
| 2007 | 2 | 0 |
| 2008 | 0 | 0 |
| 2009 | 2 | 3 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 2 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 3 | 2 |
| 2025 | 2 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for producing fiber-reinforced bio-composites incorporating agricultural waste fibers, bio-based binders, and carbon nanomaterials10 Feb 2026US 12,546,062 B1United Arab Emirates University
- Bio-composite material integrating natural fibers with bio-binders and a process for its preparation19 Aug 2025US 12,392,087 B1United Arab Emirates University
- System and method of dynamic corrective enzyme selection and formulation for pulp and paper production29 Apr 2025US 12,286,754 B2Buckman Laboratories International, Inc.
- Predictive control system and method for brown washing treatment in pulp mills3 Sep 2024US 12,077,911 B2Buckman Laboratories International, Inc.
- Method for obtaining information on quality of combustion of a liquor in a chemical recovery boiler and a method for controlling a chemical recovery boiler16 Jul 2024US 12,039,239 B2Valmet Automation Oy
- Method for controlling a process in making pulp, paper, or board27 Nov 2025US 2025/0361677 A1Kemira Oyj
- A method for chemical pulp production in a multi-stage process12 Dec 2024US 2024/0410109 A1Andritz Inc.
- 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.
- Method for obtaining information on quality of combustion of a liquor in a chemical recovery boiler and a method for controlling a chemical recovery boiler9 Sep 2021US 2021/0279390 A1Valmet Automation Oy
Most cited
By later US patents
- Method for determining the degree of completion and pulp yield42US 4,540,468 ABoard of Trustees of the University of Maine · 1985
- Method for controlling batch alkaline pulp digestion in combination with continuous alkaline oxygen delignification20US 4,595,455 AMannbro Systems Handelsbolag · 1986
- On-line analyzer12US 4,042,328 A1977
- Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical11US 4,192,708 AMo och Domsjo Aktiebolag · 1980
- Process for obtaining a predetermined Kappa number in sulfate pulping9US 3,941,649 AMo och Domsjo Aktiebolag · 1976