D21F 1/06
Regulating pulp flow
D21F1/06 (Regulating pulp flow) appears on 99 US grants and 24 published applications in this corpus.
Search patents in D21F- Granted patents
- 99
- Published applications
- 24
- Assignees
- 49
- Inventors
- 144
- Latest grant
- 20 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 4 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 9 | 0 |
| 1999 | 5 | 0 |
| 2000 | 2 | 0 |
| 2001 | 7 | 0 |
| 2002 | 4 | 2 |
| 2003 | 0 | 3 |
| 2004 | 4 | 1 |
| 2005 | 1 | 0 |
| 2006 | 1 | 3 |
| 2007 | 0 | 2 |
| 2008 | 1 | 3 |
| 2009 | 3 | 1 |
| 2010 | 1 | 0 |
| 2011 | 4 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 1 |
| 2017 | 1 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 2 | 0 |
| 2023 | 0 | 3 |
| 2024 | 1 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Sheet manufacturing apparatus20 Jan 2026US 12,529,188 B2Seiko Epson Corporation
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same19 Nov 2024US 12,146,264 B2International Paper Company
- Method of and an arrangement for adding at least one additional stock component to an approach flow system of a fiber web machine4 Oct 2022US 11,459,700 B2Valmet Technologies Oy
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same13 Sep 2022US 11,441,268 B2International Paper Company
- Method of and an arrangement for transferring a process liquid, an industrial facility and a method of simplifying the layout of such18 Jul 2017US 9,708,762 B2Sulzer Management AG
- Sheet manufacturing apparatus30 Nov 2023US 2023/0383462 A1Seiko Epson Corporation
- Sheet manufacturing apparatus30 Nov 2023US 2023/0383463 A1Seiko Epson Corporation
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same10 Aug 2023US 2023/0250582 A1International Paper Company
- Method of and an arrangement for adding at least one additional stock component to an approach flow system of a fiber web machine24 Jun 2021US 2021/0189650 A1Valmet Technologies Oy
- Paper products having increased bending stiffness and cross-direction strength and methods for making the same11 Jul 2019US 2019/0211503 A1International Paper Company
Most cited
By later US patents
- Cross-direction actuator and control system with adaptive footprint58US 7,513,975 B2Honeywell International Inc. · 2009
- Method for regulating basis weight of paper or board in a paper or board machine51US 6,203,667 B1Neles Paper Automation Oy · 2001
- Control system for papermaking machine headbox39US 4,374,703 ACentre Technique De L' Industrie Des Papiers, Cartons Et Celluloses · 1983
- Headbox apparatus with stock dilution conduits for basis weight control39US 5,196,091 ABeloit Technologies, Inc. · 1993
- Method for overall regulation of a former of a paper machine or equivalent32US 5,825,653 AValmet Corporation · 1998