D21C 7/12
Devices for regulating or controlling
D21C7/12 (Devices for regulating or controlling) appears on 97 US grants and 60 published applications in this corpus.
Search patents in D21C- Granted patents
- 97
- Published applications
- 60
- Assignees
- 56
- Inventors
- 172
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 1 | 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 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 6 | 0 |
| 1994 | 6 | 0 |
| 1995 | 1 | 0 |
| 1996 | 8 | 0 |
| 1997 | 6 | 0 |
| 1998 | 4 | 0 |
| 1999 | 0 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 2 |
| 2002 | 3 | 3 |
| 2003 | 1 | 2 |
| 2004 | 1 | 2 |
| 2005 | 2 | 2 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 3 |
| 2009 | 1 | 6 |
| 2010 | 4 | 1 |
| 2011 | 1 | 1 |
| 2012 | 2 | 3 |
| 2013 | 1 | 2 |
| 2014 | 1 | 2 |
| 2015 | 2 | 2 |
| 2016 | 0 | 2 |
| 2017 | 2 | 3 |
| 2018 | 1 | 0 |
| 2019 | 4 | 3 |
| 2020 | 0 | 1 |
| 2021 | 2 | 4 |
| 2022 | 1 | 5 |
| 2023 | 1 | 3 |
| 2024 | 5 | 2 |
| 2025 | 3 | 4 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Optimization of chemical consumption in biomass delignification4 Aug 2026US 12,698,589 B2Sixring Inc.
- Method of controlling enzymatic activities and tools related thereto21 Jul 2026US 12,686,971 B2Kemira Oyj
- Arrangement and method for pretreatment of biomass6 Jan 2026US 12,516,473 B2Sekab E-Technology AB
- Method and system for continuously treating biomass material12 Aug 2025US 12,385,184 B2Valmet Corporation
- Ragger systems and methods for removing solid debris from pulping processes17 Jun 2025US 12,331,459 B2Kadant Black Clawson LLC
- System and method for controlling the cleaning of a feeder housing in a high-pressure feeder24 Sep 2026US 2026/0286606 A1Valmet Corporation
- Method and system for treating biomass material6 Aug 2026US 2026/0226397 A1Valmet Corporation
- Ragger systems and methods for removing solid debris from pulping processes28 Aug 2025US 2025/0270759 A1Kadant Black Clawson LLC
- Optimization of chemical consumption in biomass delignification13 Feb 2025US 2025/0052002 A1Sixring Inc.
- Reactor discharge30 Jan 2025US 2025/0034806 A1Valmet Corporation
Most cited
By later US patents
- Control system for controlling a pulp washing system using a neural network controller95US 5,282,131 ABrown and Root Industrial Services, Inc. · 1994
- Method for producing continuous in-like kappa measurements for papermaking pulps47US 6,069,688 AHoneywell International Inc. · 2000
- Determination of sodium sulfide and sulfidity in green liquors and smelt solutions34US 5,616,214 APulp and Paper Research Institute of Canada · 1997
- Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute26US 5,635,025 AAhlstrom Machinery Inc. · 1997
- On-line measurement of lignin in wood pulp by color shift of fluorescence23US 5,486,915 AThe Babcock & Wilcox Company · 1996