D21C 7/00
Digesters
D21C7/00 (Digesters) appears on 495 US grants and 359 published applications in this corpus.
Search patents in D21C- Granted patents
- 495
- Published applications
- 359
- Assignees
- 194
- Inventors
- 644
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 7 | 0 |
| 1978 | 7 | 0 |
| 1979 | 5 | 0 |
| 1980 | 7 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 7 | 0 |
| 1990 | 6 | 0 |
| 1991 | 12 | 0 |
| 1992 | 7 | 0 |
| 1993 | 12 | 0 |
| 1994 | 10 | 0 |
| 1995 | 9 | 0 |
| 1996 | 17 | 0 |
| 1997 | 20 | 0 |
| 1998 | 18 | 0 |
| 1999 | 7 | 0 |
| 2000 | 28 | 0 |
| 2001 | 19 | 10 |
| 2002 | 18 | 14 |
| 2003 | 10 | 22 |
| 2004 | 3 | 15 |
| 2005 | 5 | 13 |
| 2006 | 6 | 9 |
| 2007 | 8 | 8 |
| 2008 | 9 | 15 |
| 2009 | 9 | 15 |
| 2010 | 10 | 17 |
| 2011 | 8 | 14 |
| 2012 | 9 | 21 |
| 2013 | 13 | 11 |
| 2014 | 26 | 19 |
| 2015 | 15 | 12 |
| 2016 | 14 | 14 |
| 2017 | 12 | 21 |
| 2018 | 10 | 7 |
| 2019 | 14 | 15 |
| 2020 | 4 | 14 |
| 2021 | 11 | 22 |
| 2022 | 19 | 12 |
| 2023 | 5 | 10 |
| 2024 | 18 | 12 |
| 2025 | 6 | 10 |
| 2026 | 9 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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
- Process and system for producing pulp, energy, and bioderivatives from plant-based and recycled materials14 Jul 2026US 12,678,759 B2Circ, LLC
- Method and apparatus for treating mixtures of liquids and solids19 May 2026US 12,630,976 B2Lean Pulp Oy
- Process and system for producing pulp, energy, and bioderivatives from plant-based and recycled materials28 Apr 2026US 12,611,644 B2Circ, LLC
- Screw housing and plug screw feeder1 Oct 2026US 2026/0297847 A1Valmet Corporation
- System and method for controlling the cleaning of a feeder housing in a high-pressure feeder24 Sep 2026US 2026/0286606 A1Valmet Corporation
- Discharge screw arrangement24 Sep 2026US 2026/0286607 A1Valmet Corporation
- Discharge arrangement for discharging lignocellulosic material17 Sep 2026US 2026/0275632 A1Valmet Corporation
- Process and System for Producing Pulp, Energy, and Bioderivatives from Plant-Based and Recycled Materials10 Sep 2026US 2026/0264040 A1Circ, LLC
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 and apparatus for grinding chips into paper pulp73US 4,088,528 A1978
- System and method for preextraction of hemicellulose through using a continuous prehydrolysis and steam explosion pretreatment process51US 8,057,639 B2Andritz Inc. · 2011
- Method and apparatus for mixing chemicals into fiber pulp48US 4,908,101 AHedemora AB · 1990
- Method for producing continuous in-like kappa measurements for papermaking pulps47US 6,069,688 AHoneywell International Inc. · 2000