D21F 5/00
Dryer section of machines for making continuous webs of paper
D21F5/00 (Dryer section of machines for making continuous webs of paper) appears on 1,249 US grants and 565 published applications in this corpus.
Search patents in D21F- Granted patents
- 1,249
- Published applications
- 565
- Assignees
- 319
- Inventors
- 1,580
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 20 | 0 |
| 1977 | 9 | 0 |
| 1978 | 20 | 0 |
| 1979 | 10 | 0 |
| 1980 | 26 | 0 |
| 1981 | 18 | 0 |
| 1982 | 18 | 0 |
| 1983 | 16 | 0 |
| 1984 | 24 | 0 |
| 1985 | 37 | 0 |
| 1986 | 21 | 0 |
| 1987 | 25 | 0 |
| 1988 | 20 | 0 |
| 1989 | 27 | 0 |
| 1990 | 31 | 0 |
| 1991 | 35 | 0 |
| 1992 | 32 | 0 |
| 1993 | 23 | 0 |
| 1994 | 28 | 0 |
| 1995 | 34 | 0 |
| 1996 | 48 | 0 |
| 1997 | 43 | 0 |
| 1998 | 47 | 0 |
| 1999 | 56 | 0 |
| 2000 | 57 | 0 |
| 2001 | 42 | 8 |
| 2002 | 50 | 32 |
| 2003 | 27 | 27 |
| 2004 | 32 | 34 |
| 2005 | 23 | 18 |
| 2006 | 21 | 23 |
| 2007 | 11 | 27 |
| 2008 | 10 | 22 |
| 2009 | 10 | 27 |
| 2010 | 20 | 21 |
| 2011 | 17 | 11 |
| 2012 | 14 | 12 |
| 2013 | 11 | 15 |
| 2014 | 8 | 13 |
| 2015 | 8 | 15 |
| 2016 | 15 | 24 |
| 2017 | 12 | 15 |
| 2018 | 16 | 30 |
| 2019 | 20 | 33 |
| 2020 | 32 | 28 |
| 2021 | 31 | 27 |
| 2022 | 22 | 28 |
| 2023 | 24 | 23 |
| 2024 | 19 | 26 |
| 2025 | 16 | 12 |
| 2026 | 13 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- D21F 5/02Drying on cylinders737
- D21F 5/18Drying webs by hot air372
- D21F 5/004Drying webs by contact with heated surfaces or materials55
- D21F 5/001Drying webs by radiant heating53
- D21F 5/16Drying webs by electrical heating48
- D21F 5/20Waste heat recovery48
- D21F 5/14Drying webs by applying vacuum29
- D21F 5/006Drying webs by using sonic vibrations20
Recent patents
- Method of controlling the drying of cellulose pulp in a drying step of a pulp production process15 Sep 2026US 12,735,841 B2Andritz Technology and Asset Management GmbH
- Sheet separating apparatus and sheet manufacturing apparatus8 Sep 2026US 12,729,484 B2Seiko Epson Corporation
- Moving fluid in a rotating cylinder11 Aug 2026US 12,703,945 B2
- Fibrous structures4 Aug 2026US 12,698,594 B2The Procter & Gamble Company
- Sheet manufacturing apparatus21 Jul 2026US 12,686,972 B2Seiko Epson Corporation
- Method for applying coating chemicals to yankee dryers for tissue and towel production1 Oct 2026US 2026/0297849 A1Ecolab USA Inc.
- Polyamidoamine-epihalohydrin yankee adhesives with enhanced stability10 Sep 2026US 2026/0265594 A1Ecolab USA Inc.
- Paper making machine27 Aug 2026US 2026/0250907 A1Toscotec S.P.A.
- Hybrid gas/electric air heating system for material drying systems6 Aug 2026US 2026/0226682 A1Andritz Canada Inc.
- Apparatus for the treatment of paper material23 Jul 2026US 2026/0210043 A1Toscotec S.P.A.
Most cited
By later US patents
- Wide wale tissue sheets and method of making same130US 6,673,202 B2Kimberly-Clark Worldwide, Inc. · 2004
- Systems for tissue dried with metal bands120US 6,701,637 B2Kimberly-Clark Worldwide, Inc. · 2004
- Paper having penninsular segments115US 5,906,710 AThe Procter & Gamble Company · 1999
- Impingement air dry process for making absorbent sheet115US 6,447,640 B1Georgia-Pacific Corporation · 2002
- Wet crepe, impingement-air dry process for making absorbent sheet110US 6,432,267 B1Georgia-Pacific Corporation · 2002