G11B 2220/20
Disc-shaped record carriers
G11B2220/20 (Disc-shaped record carriers) appears on 13,762 US grants and 12,195 published applications in this corpus.
Search patents in G11B- Granted patents
- 13,762
- Published applications
- 12,195
- Assignees
- 1,433
- Inventors
- 13,882
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 5 | 0 |
| 1978 | 19 | 0 |
| 1979 | 13 | 0 |
| 1980 | 12 | 0 |
| 1981 | 14 | 0 |
| 1982 | 22 | 0 |
| 1983 | 22 | 0 |
| 1984 | 28 | 0 |
| 1985 | 51 | 0 |
| 1986 | 47 | 0 |
| 1987 | 71 | 0 |
| 1988 | 84 | 0 |
| 1989 | 127 | 0 |
| 1990 | 110 | 0 |
| 1991 | 88 | 0 |
| 1992 | 129 | 0 |
| 1993 | 149 | 0 |
| 1994 | 164 | 0 |
| 1995 | 211 | 0 |
| 1996 | 238 | 0 |
| 1997 | 273 | 0 |
| 1998 | 418 | 0 |
| 1999 | 386 | 0 |
| 2000 | 444 | 0 |
| 2001 | 502 | 384 |
| 2002 | 546 | 987 |
| 2003 | 557 | 912 |
| 2004 | 583 | 1210 |
| 2005 | 464 | 1256 |
| 2006 | 784 | 1259 |
| 2007 | 742 | 1411 |
| 2008 | 800 | 1173 |
| 2009 | 840 | 902 |
| 2010 | 947 | 771 |
| 2011 | 1015 | 636 |
| 2012 | 892 | 430 |
| 2013 | 700 | 248 |
| 2014 | 477 | 163 |
| 2015 | 225 | 90 |
| 2016 | 132 | 65 |
| 2017 | 80 | 60 |
| 2018 | 68 | 44 |
| 2019 | 68 | 35 |
| 2020 | 50 | 32 |
| 2021 | 29 | 16 |
| 2022 | 24 | 23 |
| 2023 | 22 | 34 |
| 2024 | 29 | 31 |
| 2025 | 29 | 18 |
| 2026 | 21 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G11B 2220/25Characterised in that the disc is based on a specific recording technologyIndexing code10,900
- G11B 2220/21Characterised in that the disc is of read-only, rewritable, or recordable typeIndexing code4,501
- G11B 2220/23Characterised in that the disc has a specific layer structureIndexing code621
Recent patents
- Switch device and hard disk device1 Sep 2026US 12,726,194 B2Rohm Co., Ltd.
- Optical signal transmission in a hard disk drive25 Aug 2026US 12,718,840 B2Seagate Technology LLC
- Increased VCM current resolution during track follow to decrease NRRO11 Aug 2026US 12,706,116 B2Western Digital Technologies, Inc.
- Disk device with exposed inner surface regions for improved cover coupling4 Aug 2026US 12,700,427 B2Kabushiki Kaisha Toshiba
- Near field transducers having magnetic inlays for improved heat-assisted magnetic recording28 Jul 2026US 12,694,897 B1Seagate Technology LLC
- Reproduction device, reproduction method, and recording medium17 Sep 2026US 2026/0281411 A1Saturn Licensing LLC
- Reproduction device, reproduction method, and recording medium27 Aug 2026US 2026/0254918 A1Saturn Licensing LLC
- Air bearing design for high oxygen partial pressure for heat-assisted magnetic recording30 Jul 2026US 2026/0221152 A1Western Digital Technologies, Inc.
- Disk device16 Jul 2026US 2026/0204284 A1Kabushiki Kaisha Toshiba
- Handling write commands during a refresh operation in a shingled magnetic recording drive15 Jan 2026US 2026/0018186 A1Kabushiki Kaisha Toshiba
Most cited
By later US patents
- Multimedia time warping system1,079US 6,233,389 B1TiVo Inc. · 2001
- Video communications system having a remotely controlled central source of video and audio data1,037US 4,949,187 A1990
- Integration of music from a personal library with real-time information1,026US 6,192,340 B12001
- Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels1,021US 5,943,422 AIntertrust Technologies Corporation · 1999
- Mass data storage and retrieval system997US 5,504,873 AE-Systems, Inc. · 1996