D21F 9/04
Complete machines for making continuous webs of paper: of the cylinder type
Official title: of the cylinder type
D21F9/04 (Complete machines for making continuous webs of paper: of the cylinder type) appears on 57 US grants and 34 published applications in this corpus.
Search patents in D21F- Granted patents
- 57
- Published applications
- 34
- Assignees
- 40
- Inventors
- 105
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 2 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 1 |
| 2013 | 3 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 5 |
| 2016 | 3 | 2 |
| 2017 | 3 | 1 |
| 2018 | 2 | 1 |
| 2019 | 1 | 5 |
| 2020 | 0 | 1 |
| 2021 | 5 | 2 |
| 2022 | 0 | 2 |
| 2023 | 5 | 3 |
| 2024 | 2 | 2 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Sheet manufacturing apparatus and sheet manufacturing method17 Feb 2026US 12,553,183 B2Seiko Epson Corporation
- Rotary filter apparatus for roll-to-roll nanomaterial dispersion papermaking1 Jul 2025US 12,343,683 B2Bulk Nano Processing LLC
- Paper forming mold, mold manufacturing method, and paper manufactured by forming mold11 Jun 2024US 12,006,629 B2Chengdu Banknote Printing Co., Ltd
- Fiber body manufacturing apparatus, fiber body manufacturing unit, and fiber body manufacturing method5 Mar 2024US 11,920,300 B2Seiko Epson Corporation
- Defibrating apparatus and fiber body manufacturing apparatus26 Dec 2023US 11,851,817 B2Seiko Epson Corporation
- Sheet manufacturing apparatus and sheet manufacturing method4 Apr 2024US 2024/0110334 A1Seiko Epson Corporation
- Rotary Filter Apparatus For Roll-To-Roll Nanomaterial Dispersion Papermaking21 Mar 2024US 2024/0091713 A1Bulk Nano Processing LLC
- Paper forming mold, mold manufacturing method, and paper manufactured by forming mold9 Feb 2023US 2023/0037506 A1Chengdu Banknote Printing Co., Ltd
- Defibrating apparatus and fiber body manufacturing apparatus2 Feb 2023US 2023/0029664 A1Seiko Epson Corporation
- Defibrating apparatus and fiber body manufacturing apparatus2 Feb 2023US 2023/0034767 A1Seiko Epson Corporation
Most cited
By later US patents
- Device for liquid-treating a running fiber web, including an arc-shaped duct23US 3,980,518 ASunds Aktiebolag · 1976
- Wetlay process for manufacture of highly-oriented fibrous mats18US 6,066,235 AE. I. Du Pont de Nemours and Company · 2000
- Vacuum filtration system and method of filtering pulp fibers from pulp slurry using the same13US 5,281,343 AIngersoll-Rand Company · 1994
- Single-layer and multi-layer paper making apparatus11US 3,951,736 A1976
- Papermaking machine headbox having a feed channel and an adjacent overflow sump9US 4,146,425 ASulzer Brothers Limited · 1979