G11B 5/70652
Gamma - fe2 o3
Official title: {gamma - Fe2 O3}
G11B5/70652 (Gamma - fe2 o3) appears on 163 US grants and 20 published applications in this corpus.
Search patents in G11B- Granted patents
- 163
- Published applications
- 20
- Assignees
- 56
- Inventors
- 321
- Latest grant
- 6 Jun 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 14 | 0 |
| 1978 | 12 | 0 |
| 1979 | 4 | 0 |
| 1980 | 8 | 0 |
| 1981 | 8 | 0 |
| 1982 | 10 | 0 |
| 1983 | 5 | 0 |
| 1984 | 9 | 0 |
| 1985 | 5 | 0 |
| 1986 | 10 | 0 |
| 1987 | 7 | 0 |
| 1988 | 10 | 0 |
| 1989 | 13 | 0 |
| 1990 | 2 | 0 |
| 1991 | 6 | 0 |
| 1992 | 5 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 2 |
| 2003 | 0 | 0 |
| 2004 | 1 | 3 |
| 2005 | 1 | 1 |
| 2006 | 1 | 1 |
| 2007 | 2 | 2 |
| 2008 | 1 | 0 |
| 2009 | 0 | 1 |
| 2010 | 2 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 9 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Magnetic tape having characterized coefficient of variation of e-iron oxide powder particle size, magnetic tape cartridge, and magnetic recording and reproducing apparatus6 Jun 2023US 11,670,333 B2FUJIFILM Corporation
- Spinel-type ferrimagnetic particles, process for producing the same, and magnetic recording medium using the same13 Mar 2012US 8,133,405 B2Toda Kogyo Corporation
- Ferromagnetic powder, and coating material and magnetic recording medium using same27 Jul 2010US 7,763,352 B2Dowa Electronics Materials Co., Ltd.
- Ferrite thin film, method of manufacturing the same and electromagnetic noise suppressor using the same19 Jan 2010US 7,648,774 B2NEC Tokin Corporation
- Ferrite thin film, method of manufacturing the same and electromagnetic noise suppressor using the same21 Oct 2008US 7,438,946 B2NEC Tokin Corporation
- Magnetic recording medium, magnetic tape cartridge, and magnetic recording and reproducing device16 Sep 2021US 2021/0287703 A1FUJIFILM Corporation
- Magnetic tape, magnetic tape cartridge, and magnetic recording and reproducing apparatus16 Sep 2021US 2021/0287704 A1FUJIFILM Corporation
- Magnetic recording medium, magnetic tape cartridge, and magnetic recording and reproducing device16 Sep 2021US 2021/0287705 A1FUJIFILM Corporation
- Magnetic recording medium, magnetic tape cartridge, and magnetic recording and reproducing device16 Sep 2021US 2021/0287707 A1FUJIFILM Corporation
- Magnetic recording medium, magnetic tape cartridge, and magnetic recording and reproducing device16 Sep 2021US 2021/0287708 A1FUJIFILM Corporation
Most cited
By later US patents
- Longitudinal magnetic coated recording medium113US 4,746,569 AFujitsu Limited · 1988
- Process for preparing magnetic iron oxide and magnetic iron oxide produced thereby54US 4,200,680 AFuji Photo Film Co., Ltd. · 1980
- Magnetic particles53US 5,217,804 AEastman Kodak Company · 1993
- Magnetic recording elements and process of preparation43US 4,163,823 AEastman Kodak Company · 1979
- Process for producing magnetic powder having high coercive force41US 4,321,302 ATDK Electronics Co., Ltd. · 1982