G11B 20/1488
Characterised by the use of three levels
Official title: {characterised by the use of three levels}
G11B20/1488 (Characterised by the use of three levels) appears on 57 US grants and 16 published applications in this corpus.
Search patents in G11B- Granted patents
- 57
- Published applications
- 16
- Assignees
- 28
- Inventors
- 87
- Latest grant
- 22 Aug 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 2 |
| 2005 | 0 | 0 |
| 2006 | 2 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 2 |
| 2010 | 2 | 1 |
| 2011 | 2 | 0 |
| 2012 | 2 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 3 | 3 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 0 |
| 2023 | 1 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Magnetic disk device and method of generating write data22 Aug 2023US 11,735,209 B2Kabushiki Kaisha Toshiba
- Recording apparatus, recording method, reproduction apparatus, reproduction method, recording medium, encoding apparatus, and decoding apparatus6 Dec 2022US 11,521,651 B2Sony Corporation
- Magnetic recording system with ternary pattern dependent write signaling5 Sep 2017US 9,754,610 B2Avago Technologies General IP (Singapore) Pte. Ltd.
- Magnetic recording system including differentiated write current emphasis signal generator circuit1 Aug 2017US 9,721,588 B2Avago Technologies General IP (Singapore) Pte. Ltd.
- Magnetic recording system using pattern dependent writer having register pages for storing write currents25 Jul 2017US 9,715,887 B2Avago Technologies General IP (Singapore) Pte. Ltd.
- Magnetic disk device and method of generating write data16 Mar 2023US 2023/0081206 A1Kabushiki Kaisha Toshiba
- Recording apparatus, recording method, reproduction apparatus, reproduction method, recording medium, encoding apparatus, and decoding apparatus9 Dec 2021US 2021/0383835 A1Sony Corporation
- Magnetic recording system using pattern dependent writer having register pages for storing write currents29 Jun 2017US 2017/0186448 A1Avago Technologies General IP (Singapore) Pte. Ltd.
- Magnetic recording system including differentiated write current emphasis signal generator circuit29 Jun 2017US 2017/0186449 A1Avago Technologies General IP (Singapore) Pte. Ltd.
- Magnetic Recording System With Ternary Pattern Dependent Write Signaling22 Jun 2017US 2017/0178670 A1Avago Technologies General IP (Singapore) Pte. Ltd.
Most cited
By later US patents
- Read signal detection in ternary 3PM magnetic recording99US 4,544,963 ASperry Corporation · 1985
- Digital coding technique which avoids loss of synchronization67US 5,461,379 AAT&T IPM Corp. · 1995
- Method and apparatus for processing sample values in a coded signal processing channel54US 4,945,538 AInternational Business Machines Corporation · 1990
- Automatic threshold tracking system53US 4,399,474 AAmpex Corporation · 1983
- Direction-constrained ternary codes using peak and polarity detection50US 4,566,044 AInternational Business Machines Corporation · 1986