D21D 5/26
De-aeration of paper stock
D21D5/26 (De-aeration of paper stock) appears on 81 US grants and 28 published applications in this corpus.
Search patents in D21D- Granted patents
- 81
- Published applications
- 28
- Assignees
- 47
- Inventors
- 115
- Latest grant
- 24 Dec 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 5 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 10 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 6 | 0 |
| 2000 | 3 | 0 |
| 2001 | 0 | 0 |
| 2002 | 4 | 1 |
| 2003 | 1 | 2 |
| 2004 | 4 | 3 |
| 2005 | 2 | 3 |
| 2006 | 1 | 1 |
| 2007 | 1 | 4 |
| 2008 | 1 | 1 |
| 2009 | 1 | 1 |
| 2010 | 4 | 2 |
| 2011 | 2 | 3 |
| 2012 | 3 | 2 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 1 | 1 |
| 2021 | 2 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Arrangement and method for degassing a pump24 Dec 2024US 12,173,451 B2Andritz Inc.
- Apparatus and method for processing white water in a paper machine8 Jun 2021US 11,028,533 B2Valmet Aktiebolag
- Deaeration apparatus23 Feb 2021US 10,926,198 B2Boe Technology Group Co., Ltd.
- Apparatus and method for processing white water in a paper machine4 Feb 2020US 10,550,517 B2Valmet Aktiebolag
- Unit and method for deaeration of drainage water22 Jul 2014US 8,784,538 B2Valmet Corporation
- Arrangement and method for degassing a pump27 Mar 2025US 2025/0101681 A1Andritz Inc.
- Arrangement and method for degassing a pump27 Jan 2022US 2022/0025578 A1Andritz Inc.
- Apparatus and method for processing white water in a paper machine30 Apr 2020US 2020/0131704 A1Valmet Aktiebolag
- Deaeration apparatus28 Feb 2019US 2019/0060792 A1Boe Technology Group Co., Ltd.
- Apparatus and method for processing white water in a paper machine21 Jun 2018US 2018/0171554 A1Valmet Aktiebolag
Most cited
By later US patents
- Apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material130US 5,209,641 AKamyr, Inc. · 1993
- Apparatus and method for deaerating or degassing a paper stock suspension49US 5,268,077 ASulzer Esher Wyss GmbH · 1993
- Controlling operation of a centrifugal pump42US 4,435,193 AKamyr, Inc. · 1984
- Method and an apparatus for separating a gas from a fibre suspension37US 4,410,337 AA. Ahlstrom Osakeyhtio · 1983
- Combined fluidizing and vacuum pump27US 4,776,758 AKamyr, Inc. · 1988