G11B 23/087
Using two different reels or cores
Official title: using two different reels or cores
G11B23/087 (Using two different reels or cores) appears on 1,708 US grants and 242 published applications in this corpus.
Search patents in G11B- Granted patents
- 1,708
- Published applications
- 242
- Assignees
- 213
- Inventors
- 1,511
- Latest grant
- 3 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 24 | 0 |
| 1977 | 24 | 0 |
| 1978 | 31 | 0 |
| 1979 | 14 | 0 |
| 1980 | 27 | 0 |
| 1981 | 25 | 0 |
| 1982 | 33 | 0 |
| 1983 | 43 | 0 |
| 1984 | 54 | 0 |
| 1985 | 64 | 0 |
| 1986 | 64 | 0 |
| 1987 | 75 | 0 |
| 1988 | 73 | 0 |
| 1989 | 71 | 0 |
| 1990 | 65 | 0 |
| 1991 | 70 | 0 |
| 1992 | 59 | 0 |
| 1993 | 78 | 0 |
| 1994 | 90 | 0 |
| 1995 | 81 | 0 |
| 1996 | 79 | 0 |
| 1997 | 60 | 0 |
| 1998 | 75 | 0 |
| 1999 | 57 | 0 |
| 2000 | 54 | 0 |
| 2001 | 48 | 9 |
| 2002 | 40 | 42 |
| 2003 | 42 | 43 |
| 2004 | 35 | 28 |
| 2005 | 23 | 26 |
| 2006 | 24 | 22 |
| 2007 | 25 | 12 |
| 2008 | 21 | 10 |
| 2009 | 9 | 12 |
| 2010 | 8 | 1 |
| 2011 | 6 | 2 |
| 2012 | 1 | 0 |
| 2013 | 2 | 4 |
| 2014 | 2 | 1 |
| 2015 | 2 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 1 |
| 2019 | 2 | 2 |
| 2020 | 2 | 1 |
| 2021 | 6 | 8 |
| 2022 | 6 | 3 |
| 2023 | 5 | 6 |
| 2024 | 2 | 6 |
| 2025 | 4 | 0 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Magnetic tape control system and magnetic tape control device3 Feb 2026US 12,542,152 B2FUJIFILM Corporation
- High capacity captive tape drive6 Jan 2026US 12,518,788 B2Western Digital Technologies, Inc.
- Magnetic recording medium and cartridge26 Aug 2025US 12,400,682 B2Sony Group Corporation
- Cartridge including magnetic tape including magnetic layer including protrusions on surface thereof1 Jul 2025US 12,347,457 B2Sony Group Corporation
- Tape reel with reel hub having expanding outer peripheral regions, tape cartridge, and apparatus for producing tape reel3 Jun 2025US 12,322,415 B2Sony Group Corporation
- Tape drive, tape, and storage system19 Mar 2026US 2026/0080902 A1Huawei Technologies Co., Ltd.
- Methods for Improving Track Density in Dual-Reel Removable Tape Devices and Fixed Tape Devices26 Dec 2024US 2024/0428823 A1Western Digital Technologies, Inc.
- High Capacity Captive Tape Drive19 Dec 2024US 2024/0420736 A1Western Digital Technologies, Inc.
- Magnetic recording medium and cartridge23 May 2024US 2024/0170015 A1Sony Group Corporation
- Cartridge23 May 2024US 2024/0170019 A1Sony Group Corporation
Most cited
By later US patents
- Apparatus and method for tracking the playing of VCR programs447US 5,488,409 A1996
- Method for selectively playing back programs recorded on a video tape191US 5,621,579 AIndex Systems, Inc. · 1997
- Enhancing operations of video tape cassette players177US 6,091,884 AIndex Systems, Inc. · 2000
- Counting computer software cartridge172US 4,553,252 A1985
- Method for encrypting and embedding information in a video program121US 5,581,614 AIndex Systems, Inc. · 1996