D21C 9/1052
Controlling the process
Official title: {Controlling the process}
D21C9/1052 (Controlling the process) appears on 37 US grants and 18 published applications in this corpus.
Search patents in D21C- Granted patents
- 37
- Published applications
- 18
- Assignees
- 31
- Inventors
- 105
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 2 |
| 2003 | 0 | 3 |
| 2004 | 3 | 2 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 2 |
| 2019 | 2 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 2 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 2 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for distributing chemicals in delignification stages of pulp bleaching process1 Sep 2026US 12,723,350 B2Andritz Inc.
- Process to optimize brown stock washing unit operations23 Dec 2025US 12,503,814 B2Ecolab USA Inc.
- Preparation of cellulose fibers21 Oct 2025US 12,448,730 B2Jena Trading Aps
- Method of making bleached microcrystalline cellulose24 Mar 2020US 10,597,820 B2DuPont Nutrition USA, Inc.
- Method for reducing pulp viscosity in production of dissolving pulp24 Dec 2019US 10,513,824 B2Kemira Oyj
- Method for distrubting chemicals in delignifiction stages of pulp bleaching process17 Apr 2025US 2025/0122668 A1Andritz Inc.
- Upcycled cellulosic fibers8 Feb 2024US 2024/0044080 A1Grasim Industries Limited
- Process to optimize brown stock washing unit operations11 Aug 2022US 2022/0251781 A1Ecolab USA Inc.
- Preparation of cellulose fibers17 Mar 2022US 2022/0081833 A1Jena Trading Aps
- Method for reducing pulp viscosity in production of dissolving pulp14 Jun 2018US 2018/0163344 A1Kemira Oyj
Most cited
By later US patents
- Method for producing continuous in-like kappa measurements for papermaking pulps47US 6,069,688 AHoneywell International Inc. · 2000
- Process for controlling the supply of delignifying and/or bleaching chemicals in the continuous delignification of lignocellulosic material33US 4,348,256 AMo och Domsjo Aktiebolag · 1982
- Method for control of chemicals during gas treatment of suspensions32US 4,419,184 AKamyr, Inc. · 1983
- Control scheme for rapid pulp delignification and bleaching29US 5,672,247 AUnion Camp Patent Holding, Inc. · 1997
- Method for controlling an oxygen bleaching19US 4,840,703 ARauma-Repola Oy · 1989