D21D 1/306
Discs
Official title: {Discs}
D21D1/306 (Discs) appears on 219 US grants and 191 published applications in this corpus.
Search patents in D21D- Granted patents
- 219
- Published applications
- 191
- Assignees
- 71
- Inventors
- 243
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 10 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 2 |
| 2002 | 5 | 5 |
| 2003 | 5 | 8 |
| 2004 | 3 | 3 |
| 2005 | 7 | 4 |
| 2006 | 3 | 9 |
| 2007 | 4 | 5 |
| 2008 | 6 | 7 |
| 2009 | 3 | 8 |
| 2010 | 6 | 1 |
| 2011 | 9 | 7 |
| 2012 | 4 | 9 |
| 2013 | 5 | 9 |
| 2014 | 3 | 10 |
| 2015 | 9 | 5 |
| 2016 | 3 | 4 |
| 2017 | 5 | 11 |
| 2018 | 3 | 9 |
| 2019 | 10 | 11 |
| 2020 | 10 | 8 |
| 2021 | 10 | 14 |
| 2022 | 6 | 10 |
| 2023 | 12 | 10 |
| 2024 | 12 | 13 |
| 2025 | 7 | 4 |
| 2026 | 4 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Refiner filling piece having multiple coatings on bars22 Sep 2026US 12,742,288 B2Aikawa Fiber Technologies Oy
- Blade for a refiner for refining lignocellulosic material, and refiner comprising at least one blade4 Aug 2026US 12,698,591 B2Valmet Corporation
- Deflaking element for pulper10 Mar 2026US 12,571,161 B2Kadant Black Clawson LLC
- Apparatus and method for processing wood fibers17 Feb 2026US 12,553,182 B2International Paper Company
- Refiner11 Nov 2025US 12,467,201 B2Aikawa Iron Works Co., Ltd.
- Blade for a refiner for refining lignocellulosic material, and refiner comprising at least one blade1 Oct 2026US 2026/0297848 A1Valmet Corporation
- Method, system and program for producing a refiner segment out of a worn refiner segment, and a rebuilt refiner segment20 Aug 2026US 2026/0241456 A1Valmet Corporation
- Refiner bars having stepped coatings8 Jan 2026US 2026/0009180 A1Aikawa Fiber Technologies Oy
- Refiner filling piece having variably coated spacer-integrated bars8 Jan 2026US 2026/0009181 A1Aikawa Fiber Technologies Oy
- Gap width monitoring1 Jan 2026US 2026/0001080 A1Cellwood Machinery AB
Most cited
By later US patents
- High flow, low intensity plate for disc refiner73US 5,425,508 ABeloit Technologies, Inc. · 1995
- Refiner plate with variable pitch51US 5,893,525 ADurametal Corporation · 1999
- Refining element49US 5,695,136 ASunds Defibrator Industries AB · 1997
- Refiner disc segment38US 4,635,864 ASCA Development Aktiebolag · 1987
- Papermaking refiner plates and method of manufacture35US 7,779,525 B2Advanced Fiber Technologies (AFT) Trust · 2010