D21F 5/18
Drying webs by hot air
D21F5/18 (Drying webs by hot air) appears on 372 US grants and 309 published applications in this corpus.
Search patents in D21F- Granted patents
- 372
- Published applications
- 309
- Assignees
- 120
- Inventors
- 623
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 9 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 11 | 0 |
| 1997 | 5 | 0 |
| 1998 | 3 | 0 |
| 1999 | 9 | 0 |
| 2000 | 13 | 0 |
| 2001 | 14 | 3 |
| 2002 | 18 | 13 |
| 2003 | 15 | 13 |
| 2004 | 12 | 20 |
| 2005 | 13 | 10 |
| 2006 | 11 | 9 |
| 2007 | 5 | 15 |
| 2008 | 6 | 11 |
| 2009 | 4 | 11 |
| 2010 | 12 | 10 |
| 2011 | 12 | 4 |
| 2012 | 9 | 5 |
| 2013 | 5 | 6 |
| 2014 | 2 | 8 |
| 2015 | 3 | 5 |
| 2016 | 4 | 8 |
| 2017 | 5 | 8 |
| 2018 | 8 | 21 |
| 2019 | 14 | 23 |
| 2020 | 20 | 17 |
| 2021 | 22 | 17 |
| 2022 | 14 | 25 |
| 2023 | 16 | 15 |
| 2024 | 14 | 12 |
| 2025 | 14 | 8 |
| 2026 | 7 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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
- Fibrous structures4 Aug 2026US 12,698,594 B2The Procter & Gamble Company
- Method for applying coating chemicals to yankee dryers for tissue and towel production14 Jul 2026US 12,680,229 B2Ecolab USA Inc.
- Paper making machine and process14 Jul 2026US 12,680,230 B2Toscotec S.P.A.
- Compact high performance through-air apparatus14 Jul 2026US 12,680,757 B2Valmet 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
- 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
- Method of controlling adhesive build-up on a yankee dryer103US 7,850,823 B2Georgia-Pacific Consumer Products LP · 2010