D21F 1/74
Using cylinders
Official title: using cylinders
D21F1/74 (Using cylinders) appears on 52 US grants and 32 published applications in this corpus.
Search patents in D21F- Granted patents
- 52
- Published applications
- 32
- Assignees
- 34
- Inventors
- 92
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 4 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 5 |
| 2006 | 0 | 0 |
| 2007 | 3 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 4 |
| 2011 | 2 | 3 |
| 2012 | 6 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 2 |
| 2017 | 1 | 1 |
| 2018 | 2 | 0 |
| 2019 | 1 | 3 |
| 2020 | 1 | 2 |
| 2021 | 0 | 0 |
| 2022 | 1 | 1 |
| 2023 | 1 | 2 |
| 2024 | 1 | 1 |
| 2025 | 2 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Dewatering apparatus and process9 Jun 2026US 12,649,989 B2The Procter & Gamble Company
- Paper pulp pressure screen16 Dec 2025US 12,497,735 B1
- Method for manufacturing a film comprising highly refined cellulose fibers22 Jul 2025US 12,366,036 B2Stora Enso OYJ
- Paper pulp pressure screen20 Feb 2024US 11,905,661 B1
- Fibrous body accumulating device and estimation method27 Jun 2023US 11,686,044 B2Seiko Epson Corporation
- Dewatering apparatus and process17 Sep 2026US 2026/0275635 A1The Procter & Gamble Company
- Centrifuge rotor self-balancing apparatus15 May 2025US 2025/0153194 A1Andritz Separation Inc.
- Dewatering apparatus and process5 Dec 2024US 2024/0401271 A1The Procter & Gamble Company
- Method for manufacturing a film comprising highly refined cellulose fibers5 Oct 2023US 2023/0313464 A1Stora Enso OYJ
- Displacement dewatering a web using compressed gas21 Sep 2023US 2023/0295871 A1
Most cited
By later US patents
- Roll press for removing water from a web of paper using solid grooved roll and compressed air61US 4,888,096 AInotech Process Ltd. · 1989
- Pressure pulp washer with pivoted baffle17US 4,085,003 AIngersoll-Rand Company · 1978
- Pulp slurry-handling press roll and twin and single roll slurry handling presses15US 5,667,642 ABeloit Technologies, Inc. · 1997
- Device for dehydrating and washing suspensions of fibrous material14US 6,311,849 B1Andritz-Patentverwaltungs-Gesselschaft m.b.H. · 2001
- Apparatus for treating a fibre suspension13US 4,750,340 AKamyr, Inc. · 1988