D21F 5/021
Construction of the cylinders
Official title: {Construction of the cylinders}
D21F5/021 (Construction of the cylinders) appears on 108 US grants and 59 published applications in this corpus.
Search patents in D21F- Granted patents
- 108
- Published applications
- 59
- Assignees
- 51
- Inventors
- 232
- Latest grant
- 23 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 6 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 7 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 3 |
| 2003 | 1 | 1 |
| 2004 | 2 | 1 |
| 2005 | 0 | 3 |
| 2006 | 1 | 2 |
| 2007 | 1 | 6 |
| 2008 | 1 | 3 |
| 2009 | 0 | 0 |
| 2010 | 3 | 2 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 2 | 0 |
| 2014 | 1 | 4 |
| 2015 | 1 | 2 |
| 2016 | 3 | 7 |
| 2017 | 1 | 1 |
| 2018 | 5 | 6 |
| 2019 | 5 | 4 |
| 2020 | 4 | 1 |
| 2021 | 3 | 1 |
| 2022 | 2 | 3 |
| 2023 | 3 | 2 |
| 2024 | 0 | 1 |
| 2025 | 2 | 2 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Workpiece of Yankee cylinder section and process for manufacturing a Yankee cylinder8 Aug 2023US 11,718,959 B2ANDRITZ (China) Ltd.
- Rotary joint shroud having set-up gauge and seal wear indicator7 Mar 2023US 11,598,426 B2Kadant Johnson LLC
- Collar for compressing sleeve on drum4 Jun 2026US 2026/0151982 A1Suominen Oyj
- A sleeve for a drum7 May 2026US 2026/0125836 A1Suominen Oyj
- Rotary Joint with Adjustable Syphon for Rotating Cylinder2 Oct 2025US 2025/0305607 A1Kadant Johnson LLC
- Contamination preventing agent composition10 Apr 2025US 2025/0115771 A1Maintech Co., Ltd.
- A yankee drying cylinder and a tissue paper making machine11 Jan 2024US 2024/0011222 A1Valmet Aktiebolag
Most cited
By later US patents
- Coupling for end gudgeon and internally heated roller25US 4,229,950 AEastman Kodak Company · 1980
- Yankee Dryer and method of fabrication21US 4,320,582 AUnited States Steel Corporation · 1982
- Yankee cylinder with a plasma-sprayed carbide coating19US 5,123,152 ATampella Telatek Oy · 1992
- Processing roll apparatus and method for web drying17US 5,566,473 A1996
- Method and apparatus for drying web16US 5,327,661 AInstitute of Paper Science and Technology, Inc. · 1994