D21F 1/022
Means for injecting material into flow within the headbox
Official title: {Means for injecting material into flow within the headbox}
D21F1/022 (Means for injecting material into flow within the headbox) appears on 66 US grants and 29 published applications in this corpus.
Search patents in D21F- Granted patents
- 66
- Published applications
- 29
- Assignees
- 33
- Inventors
- 135
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 5 | 0 |
| 1997 | 6 | 0 |
| 1998 | 8 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 1 |
| 2003 | 1 | 2 |
| 2004 | 2 | 1 |
| 2005 | 2 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 1 | 1 |
| 2011 | 1 | 4 |
| 2012 | 4 | 3 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 2 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 3 |
| 2022 | 3 | 0 |
| 2023 | 0 | 2 |
| 2024 | 1 | 3 |
| 2025 | 2 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Sheet manufacturing apparatus4 Aug 2026US 12,698,592 B2Seiko Epson Corporation
- Zoned and/or layered substrates and method and apparatus for producing the same6 May 2025US 12,291,819 B2Kimberly-Clark Worldwide, Inc.
- Method and apparatus for producing a zoned substrate8 Apr 2025US 12,270,154 B2Kimberly-Clark Worldwide, Inc.
- Method and apparatus for producing a zoned and/or layered substrate9 Jan 2024US 11,866,884 B2
- Method of forming a three-layer board web and a forming section of forming a three-layer board web29 Nov 2022US 11,512,431 B2Valmet Technologies Oy
- Fluid delivery and mixing nozzle2 Jul 2026US 2026/0183725 A1Solenis Technologies, L.P.
- Zoned and/or layered substrates and method and apparatus for producing the same7 Aug 2025US 2025/0250740 A1Kimberly-Clark Worldwide, Inc.
- Sheet manufacturing apparatus26 Dec 2024US 2024/0426054 A1Seiko Epson Corporation
- Papermaking machine that utilizes only a structured fabric in the forming of paper7 Nov 2024US 2024/0368838 A1Structured I, LLC
- Method and apparatus for producing a zoned substrate18 Apr 2024US 2024/0125048 A1Kimberly-Clark Worldwide, Inc.
Most cited
By later US patents
- Headbox apparatus with stock dilution conduits for basis weight control39US 5,196,091 ABeloit Technologies, Inc. · 1993
- Method of operating a headbox apparatus for a papermaking machine30US 4,888,094 ASulzer-Escher Wyss GmbH · 1989
- Headbox apparatus for a papermaking machine30US 4,897,158 ASulzer-Escher Wyss GmbH · 1990
- Apparatus and method for the manufacture of fibrous webs29US 4,686,006 AJames River-Norwalk, Inc. · 1987
- Mixing system for mixing two liquids at constant mixture volume flow for supplying the headbox of a paper machine28US 5,316,383 AJ. M. Voith GmbH · 1994