G11B 23/28
Indicating or preventing prior or unauthorised use
Official title: Indicating {or preventing} prior or unauthorised use, {e.g. cassettes with sealing or locking means, write-protect devices for discs (write-protect devices for tapes G11B23/042, G11B23/08714; dummy cassettes for locking in the drive G11B33/005)}
G11B23/28 (Indicating or preventing prior or unauthorised use) appears on 774 US grants and 586 published applications in this corpus.
Search patents in G11B- Granted patents
- 774
- Published applications
- 586
- Assignees
- 224
- Inventors
- 1,145
- Latest grant
- 27 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 8 | 0 |
| 1987 | 14 | 0 |
| 1988 | 12 | 0 |
| 1989 | 12 | 0 |
| 1990 | 8 | 0 |
| 1991 | 10 | 0 |
| 1992 | 9 | 0 |
| 1993 | 11 | 0 |
| 1994 | 13 | 0 |
| 1995 | 14 | 0 |
| 1996 | 15 | 0 |
| 1997 | 25 | 0 |
| 1998 | 40 | 0 |
| 1999 | 26 | 0 |
| 2000 | 40 | 0 |
| 2001 | 30 | 20 |
| 2002 | 32 | 61 |
| 2003 | 39 | 58 |
| 2004 | 36 | 62 |
| 2005 | 31 | 74 |
| 2006 | 40 | 61 |
| 2007 | 49 | 67 |
| 2008 | 44 | 55 |
| 2009 | 38 | 38 |
| 2010 | 41 | 23 |
| 2011 | 40 | 14 |
| 2012 | 23 | 10 |
| 2013 | 17 | 12 |
| 2014 | 8 | 5 |
| 2015 | 10 | 4 |
| 2016 | 2 | 1 |
| 2017 | 3 | 3 |
| 2018 | 7 | 5 |
| 2019 | 6 | 4 |
| 2020 | 1 | 2 |
| 2021 | 3 | 2 |
| 2022 | 2 | 1 |
| 2023 | 1 | 2 |
| 2024 | 2 | 1 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Restricted transport storage cartridges27 May 2025US 12,314,612 B2Hewlett Packard Enterprise Development LP
- Vinyl record with integrated authenticity11 Feb 2025US 12,223,981 B2Citizen Digital Inc.
- Automatic implementation of a physical barrier to protect removable storage media access2 Jul 2024US 12,027,182 B2Quantum Corporation
- Wearable recording system with memory designation19 Mar 2024US 11,937,017 B2
- Automatic implementation of a physical barrier to protect removable storage media access14 Mar 2023US 11,605,401 B2Quantum Corporation
- Vinyl record with integrated authenticity5 Jun 2025US 2025/0182789 A1Citizen Digital Inc.
- Wearable recording system with memory designation13 Jun 2024US 2024/0195942 A1Stellar, LLC
- Automatic implementation of a physical barrier to protect removable storage media access6 Jul 2023US 2023/0215463 A1Quantum Corporation
- Vinyl record with integrated authenticity2 Feb 2023US 2023/0032976 A1Citizen Digital Inc.
- Restricted transport storage cartridges3 Feb 2022US 2022/0035575 A1Hewlett Packard Enterprise Development LP
Most cited
By later US patents
- Method and apparatus for improved fingerprinting and authenticating various magnetic media361US 5,740,244 AWashington University · 1998
- Method and apparatus for fingerprinting magnetic media206US 5,365,586 AWashington University · 1994
- Method to deter document and intellectual property piracy through individualization172US 5,699,427 AInternational Business Machines Corporation · 1997
- Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk167US 5,761,301 AMatsushita Electric Industrial Co., Ltd. · 1998
- TIRIS based kernal for protection of "copyrighted" program material165US 5,905,798 ATexas Instruments Incorporated · 1999