D21F 5/20
Waste heat recovery
D21F5/20 (Waste heat recovery) appears on 48 US grants and 37 published applications in this corpus.
Search patents in D21F- Granted patents
- 48
- Published applications
- 37
- Assignees
- 39
- Inventors
- 108
- Latest grant
- 26 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 2 | 2 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 3 |
| 2010 | 1 | 2 |
| 2011 | 0 | 2 |
| 2012 | 1 | 3 |
| 2013 | 4 | 4 |
| 2014 | 2 | 1 |
| 2015 | 2 | 1 |
| 2016 | 2 | 1 |
| 2017 | 2 | 2 |
| 2018 | 1 | 1 |
| 2019 | 0 | 0 |
| 2020 | 2 | 1 |
| 2021 | 1 | 1 |
| 2022 | 0 | 3 |
| 2023 | 1 | 3 |
| 2024 | 2 | 0 |
| 2025 | 2 | 1 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for controlling process fluids in a plant for manufacturing web-like paper material26 Aug 2025US 12,398,513 B2ANDRITZ Novimpianti S.r.l.
- Control method for sheet manufacturing apparatus26 Aug 2025US 12,398,514 B2Seiko Epson Corporation
- System for reheating air in dryers20 Feb 2024US 11,906,245 B2Andritz Inc.
- Heat recovery from vacuum blowers on a paper machine6 Feb 2024US 11,891,759 B2Structured I, LLC
- System for reheating air in dryers30 May 2023US 11,662,142 B2Andritz Inc.
- Hybrid gas/electric air heating system for material drying systems6 Aug 2026US 2026/0226682 A1Andritz Canada Inc.
- A steam supply system and a method of supplying steam15 Jan 2026US 2026/0015793 A1James Cropper PLC
- A machine for producing a fibrous web7 Aug 2025US 2025/0250739 A1Valmet Corporation
- System and method for controlling process fluids in a plant for manufacturing web-like paper material21 Sep 2023US 2023/0295872 A1ANDRITZ Novimpianti S.r.l.
- System for reheating air in dryers10 Aug 2023US 2023/0251034 A1Andritz Inc.
Most cited
By later US patents
- Process for making throughdried tissue using exhaust gas recovery73US 6,551,461 B2Kimberly-Clark Worldwide, Inc. · 2003
- Apparatus for drying a fibrous web66US 8,196,314 B2Voith Patent GmbH · 2012
- Method and apparatus for drying a fibrous web65US 8,544,184 B2Voith Patent GmbH · 2013
- Method for drying a fibrous web64US 8,402,673 B2Voith Patent GmbH · 2013
- Method and apparatus for drying a fibrous web63US 8,435,384 B2Voith Patent GmbH · 2013