D21G 9/0009
Paper-making control systems
Official title: {Paper-making control systems}
D21G9/0009 (Paper-making control systems) appears on 570 US grants and 518 published applications in this corpus.
Search patents in D21G- Granted patents
- 570
- Published applications
- 518
- Assignees
- 213
- Inventors
- 1,078
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 7 | 0 |
| 1991 | 7 | 0 |
| 1992 | 8 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 7 | 0 |
| 1996 | 4 | 0 |
| 1997 | 8 | 0 |
| 1998 | 16 | 0 |
| 1999 | 5 | 0 |
| 2000 | 19 | 0 |
| 2001 | 31 | 4 |
| 2002 | 24 | 23 |
| 2003 | 18 | 26 |
| 2004 | 20 | 23 |
| 2005 | 15 | 21 |
| 2006 | 22 | 24 |
| 2007 | 11 | 20 |
| 2008 | 14 | 18 |
| 2009 | 11 | 18 |
| 2010 | 17 | 21 |
| 2011 | 12 | 7 |
| 2012 | 17 | 12 |
| 2013 | 10 | 7 |
| 2014 | 13 | 15 |
| 2015 | 8 | 21 |
| 2016 | 21 | 27 |
| 2017 | 19 | 19 |
| 2018 | 18 | 22 |
| 2019 | 22 | 31 |
| 2020 | 13 | 15 |
| 2021 | 23 | 25 |
| 2022 | 15 | 21 |
| 2023 | 22 | 30 |
| 2024 | 18 | 29 |
| 2025 | 21 | 30 |
| 2026 | 16 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Adjusting rolls22 Sep 2026US 12,742,289 B2Voith Patent GmbH
- Method of controlling the drying of cellulose pulp in a drying step of a pulp production process15 Sep 2026US 12,735,841 B2Andritz Technology and Asset Management GmbH
- Method for distributing chemicals in delignification stages of pulp bleaching process1 Sep 2026US 12,723,350 B2Andritz Inc.
- Automated interframe alignment monitoring for sheet manufacturing applications25 Aug 2026US 12,716,823 B2Honeywell International Inc.
- Predictive and real time process intervention involving a multi-component defoamer feed unit18 Aug 2026US 12,709,840 B2Buckman Laboratories International, Inc.
- Sheet manufacturing apparatus10 Sep 2026US 2026/0265998 A1Seiko Epson Corporation
- Hybrid gas/electric air heating system for material drying systems6 Aug 2026US 2026/0226682 A1Andritz Canada Inc.
- Method and apparatus for managing paper-making process using digital twin30 Jul 2026US 2026/0218452 A1Electronics and Telecommunications Research Institute
- Apparatus for the treatment of paper material23 Jul 2026US 2026/0210043 A1Toscotec S.P.A.
- System and method for producing fiber molded products2 Jul 2026US 2026/0185302 A1
Most cited
By later US patents
- Control system using process model108US 6,772,036 B2Fisher-Rosemount Systems, Inc. · 2004
- Model predictive controller for coordinated cross direction and machine direction control78US 6,807,510 B1Honeywell ACSA Inc. · 2004
- Method and apparatus for controlling an extended process77US 5,715,158 AABB Industrial Systems, Inc. · 1998
- Automated tuning of large-scale multivariable model predictive controllers for spatially-distributed processes67US 7,650,195 B2Honeywell ASCa Inc. · 2010
- Method and equipment for controlling properties of paper66US 6,319,362 B1Metso Paper Automation Oy · 2001