G11B 20/1403
Characterised by the use of two levels
Official title: {characterised by the use of two levels}
G11B20/1403 (Characterised by the use of two levels) appears on 2,982 US grants and 1,551 published applications in this corpus.
Search patents in G11B- Granted patents
- 2,982
- Published applications
- 1,551
- Assignees
- 464
- Inventors
- 3,114
- Latest grant
- 20 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 24 | 0 |
| 1977 | 31 | 0 |
| 1978 | 9 | 0 |
| 1979 | 17 | 0 |
| 1980 | 24 | 0 |
| 1981 | 18 | 0 |
| 1982 | 30 | 0 |
| 1983 | 26 | 0 |
| 1984 | 31 | 0 |
| 1985 | 53 | 0 |
| 1986 | 35 | 0 |
| 1987 | 29 | 0 |
| 1988 | 23 | 0 |
| 1989 | 52 | 0 |
| 1990 | 32 | 0 |
| 1991 | 25 | 0 |
| 1992 | 39 | 0 |
| 1993 | 50 | 0 |
| 1994 | 66 | 0 |
| 1995 | 87 | 0 |
| 1996 | 95 | 0 |
| 1997 | 97 | 0 |
| 1998 | 137 | 0 |
| 1999 | 118 | 0 |
| 2000 | 145 | 0 |
| 2001 | 145 | 46 |
| 2002 | 118 | 168 |
| 2003 | 134 | 174 |
| 2004 | 142 | 198 |
| 2005 | 112 | 171 |
| 2006 | 187 | 150 |
| 2007 | 190 | 217 |
| 2008 | 153 | 135 |
| 2009 | 107 | 90 |
| 2010 | 100 | 53 |
| 2011 | 83 | 34 |
| 2012 | 56 | 22 |
| 2013 | 45 | 11 |
| 2014 | 21 | 17 |
| 2015 | 19 | 10 |
| 2016 | 17 | 12 |
| 2017 | 13 | 9 |
| 2018 | 10 | 6 |
| 2019 | 12 | 13 |
| 2020 | 11 | 7 |
| 2021 | 6 | 3 |
| 2022 | 3 | 1 |
| 2023 | 3 | 2 |
| 2024 | 0 | 1 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Decision feedback equalization in semiconductor devices20 May 2025US 12,308,049 B2Macronix International Co., Ltd.
- Decoding device, decoding method, program, encoding device, and encoding method7 Jan 2025US 12,190,894 B2Sony Group Corporation
- Synchronization signal (Sync Mark) detection using multi-frequency sinusoidal (MFS) signal-based filtering10 Oct 2023US 11,784,785 B2Avago Technologies International Sales Pte. Limited
- Method and apparatus for identifying a mover on a track9 May 2023US 11,643,281 B2Rockwell Automation Technologies, Inc.
- Pulse-based writing for magnetic storage media17 Jan 2023US 11,557,316 B2Marvell Asia Pte Ltd
- Decoding device, decoding method, program, encoding device, and encoding method22 May 2025US 2025/0166635 A1Sony Group Corporation
- Decision feedback equalization in semiconductor devices26 Dec 2024US 2024/0428822 A1Macronix International Co., Ltd.
- Synchronization Signal (Sync Mark) Detection Using Multi-Frequency Sinusoidal (MFS) Signal-Based Filtering10 Aug 2023US 2023/0254109 A1Broadcom International Pte. Ltd.
- Decoding device, decoding method, program, encoding device, and encoding method11 May 2023US 2023/0145547 A1Sony Group Corporation
- Pulse-Based Writing for Magnetic Storage Media16 Jun 2022US 2022/0189504 A1Marvell Asia Pte Ltd
Most cited
By later US patents
- Disk drive employing read channel IC with common port for data and servo233US 6,278,568 B1Western Digital Corporation · 2001
- Disk drive employing read error tolerant sync mark detection216US 6,411,452 B1Western Digital Technologies, Inc. · 2002
- Embedded servo banded format for magnetic disks for use with a data processing system209US 5,278,703 ADigital Equipment Corporation · 1994
- Disk storage system employing error detection and correction of channel coded data, interpolated timing recovery, and retroactive/split-segment symbol synchronization180US 6,009,549 ACirrus Logic, Inc. · 1999
- Disk drive employing state variable trap registers for providing stored servo and user data state variables to sampled-data channel175US 6,178,056 B1Western Digital Corporation · 2001