D21F 7/00
Paper-making machines: other details of machines for making continuous webs of paper
Official title: Other details of machines for making continuous webs of paper
D21F7/00 (Paper-making machines: other details of machines for making continuous webs of paper) appears on 1,343 US grants and 993 published applications in this corpus.
Search patents in D21F- Granted patents
- 1,343
- Published applications
- 993
- Assignees
- 329
- Inventors
- 1,665
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 12 | 0 |
| 1979 | 9 | 0 |
| 1980 | 10 | 0 |
| 1981 | 16 | 0 |
| 1982 | 12 | 0 |
| 1983 | 19 | 0 |
| 1984 | 23 | 0 |
| 1985 | 19 | 0 |
| 1986 | 19 | 0 |
| 1987 | 32 | 0 |
| 1988 | 25 | 0 |
| 1989 | 35 | 0 |
| 1990 | 26 | 0 |
| 1991 | 25 | 0 |
| 1992 | 28 | 0 |
| 1993 | 29 | 0 |
| 1994 | 28 | 0 |
| 1995 | 21 | 0 |
| 1996 | 27 | 0 |
| 1997 | 24 | 0 |
| 1998 | 34 | 0 |
| 1999 | 26 | 0 |
| 2000 | 32 | 0 |
| 2001 | 43 | 7 |
| 2002 | 31 | 26 |
| 2003 | 22 | 21 |
| 2004 | 27 | 54 |
| 2005 | 16 | 37 |
| 2006 | 30 | 50 |
| 2007 | 15 | 59 |
| 2008 | 23 | 38 |
| 2009 | 23 | 45 |
| 2010 | 39 | 47 |
| 2011 | 37 | 21 |
| 2012 | 28 | 24 |
| 2013 | 25 | 22 |
| 2014 | 24 | 37 |
| 2015 | 26 | 42 |
| 2016 | 40 | 50 |
| 2017 | 24 | 36 |
| 2018 | 37 | 31 |
| 2019 | 23 | 52 |
| 2020 | 41 | 42 |
| 2021 | 47 | 59 |
| 2022 | 40 | 46 |
| 2023 | 44 | 43 |
| 2024 | 40 | 51 |
| 2025 | 30 | 27 |
| 2026 | 25 | 26 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- D21F 7/08Felts720
- D21F 7/06Indicating or regulating the thickness of the layer169
- D21F 7/003Indicating or regulating the moisture content of the layer122
- D21F 7/008Steam showers100
- D21F 7/001Wire-changing arrangements74
- D21F 7/04Paper-break control devices62
- D21F 7/006Cutting the edges of the paper-web45
- D21F 7/02Mechanical driving arrangements44
All 9 subgroupsShow fewer
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- Method for applying coating chemicals to yankee dryers for tissue and towel production1 Oct 2026US 2026/0297849 A1Ecolab USA Inc.
- Woven papermaking fabrics17 Sep 2026US 2026/0275638 A1Kimberly-Clark Worldwide, Inc.
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Most cited
By later US patents
- Press felt and method of manufacturing it129US 5,360,656 AAlbany International Corp. · 1994
- Press felt having fine base fabric103US 5,618,612 AHuyck Licensco, Inc. · 1997
- Papermakers fabric with stacked machine direction yarns93US 5,103,874 AAsten Group, Inc. · 1992
- Woven papermakers fabric having flat yarn floats91US 5,449,026 AAsten, Inc. · 1995
- Transfer belt in a press nip closed draw transfer90US 5,298,124 AAlbany International Corp. · 1994