G11B 5/678
Having three or more magnetic layers
Official title: {having three or more magnetic layers}
G11B5/678 (Having three or more magnetic layers) appears on 238 US grants and 235 published applications in this corpus.
Search patents in G11B- Granted patents
- 238
- Published applications
- 235
- Assignees
- 75
- Inventors
- 475
- Latest grant
- 21 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 6 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 5 |
| 2002 | 8 | 16 |
| 2003 | 15 | 20 |
| 2004 | 17 | 22 |
| 2005 | 19 | 23 |
| 2006 | 22 | 17 |
| 2007 | 13 | 21 |
| 2008 | 5 | 19 |
| 2009 | 20 | 17 |
| 2010 | 11 | 18 |
| 2011 | 13 | 11 |
| 2012 | 6 | 12 |
| 2013 | 15 | 8 |
| 2014 | 12 | 7 |
| 2015 | 11 | 2 |
| 2016 | 7 | 7 |
| 2017 | 4 | 3 |
| 2018 | 5 | 2 |
| 2019 | 1 | 1 |
| 2020 | 0 | 2 |
| 2021 | 2 | 1 |
| 2022 | 2 | 0 |
| 2023 | 1 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Magnetic recording medium with varying composition ratio and magnetic recording device21 Oct 2025US 12,451,159 B2Kabushiki Kaisha Toshiba
- Heat assisted magnetic recording media with amorphous magnetic grain boundary material22 Aug 2023US 11,735,217 B2Western Digital Technologies, Inc.
- Method of manufacturing magnetic recording medium3 May 2022US 11,322,176 B2Showa Denko K. K.
- Magnetic recording medium with multiple exchange coupling layers and small grain magnetic layers15 Mar 2022US 11,276,428 B2Western Digital Technologies, Inc.
- Magnetic recording medium with multiple exchange coupling layers and small grain magnetic layers23 Feb 2021US 10,930,313 B2Western Digital Technologies, Inc.
- Magnetic recording medium and magnetic recording device6 Jun 2024US 2024/0185884 A1Kabushiki Kaisha Toshiba
- Heat assisted magnetic recording media with amorphous magnetic grain boundary material30 Dec 2021US 2021/0407543 A1Western Digital Technologies, Inc.
- Method of manufacturing magnetic recording medium17 Dec 2020US 2020/0395045 A1Showa Denko K. K.
- Magnetic recording medium with multiple exchange coupling layers and small grain magnetic layers8 Oct 2020US 2020/0321024 A1Western Digital Technologies, Inc.
- Magnetic media design with multiple non-magnetic exchange control layers24 Oct 2019US 2019/0325905 A1Western Digital Technologies, Inc.
Most cited
By later US patents
- Magnetic recording media with antiferromagnetically coupled ferromagnetic films as the recording layer110US 6,280,813 B1International Business Machines Corporation · 2001
- Magnetic recording disk with composite perpendicular recording layer99US 6,468,670 B1International Business Machines Corporation · 2002
- Magnetic media with improved exchange coupling82US 7,070,870 B2Komag, Inc. · 2006
- Systems and methods for controlling damping of magnetic media for assisted magnetic recording79US 8,658,292 B1Western Digital Technologies, Inc. · 2014
- Magnetic recording medium, magnetic recording medium manufacturing method, and magnetic disk78US 8,076,013 B2WD Media (Singapore) Pte. Ltd. · 2011