G11B 5/70694
Non-stoechiometric ferro-ferrioxydes
Official title: {Non-stoechiometric ferro-ferrioxydes, e.g. berthollide}
G11B5/70694 (Non-stoechiometric ferro-ferrioxydes) appears on 34 US grants and 0 published applications in this corpus.
Search patents in G11B- Granted patents
- 34
- Published applications
- 0
- Assignees
- 16
- Inventors
- 80
- Latest grant
- 15 Jun 1999
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Processes for producing hydrated iron oxide and ferromagnetic iron oxide15 Jun 1999US 5,911,905 ATitan Kogyo Kabushiki Kaisha
- Magnetic iron oxide particles and method of producing the same10 Dec 1996US 5,582,914 AToda Kogyo Corporation
- Magnetic recording medium5 Mar 1996US 5,496,614 AKonica Corporation
- Low coercive iron oxide pigments and a process for their preparation2 Jan 1996US 5,480,570 AToda Kogyo Corporation
- Superparamagnetic fine particles of iron oxide and magnetic recording media containing said particles29 Nov 1994US 5,368,933 AToda Kogyo Corporation
No published applications in this class yet.
Most cited
By later US patents
- Magnetic recording material22US 4,002,804 AFuji Photo Film Co., Ltd. · 1977
- Process for producing cobalt- and iron-containing ferromagnetic powder by heat-treatment in the presence of an oxidizing agent16US 4,066,564 AFuji Photo Film Co., Ltd. · 1978
- Process for producing cobalt-containing ferromagnetic iron oxide powder16US 4,267,207 AFuji Photo Film Co., Ltd. · 1981
- Superparamagnetic fine particles of iron oxide and magnetic recording media containing said particles15US 5,368,933 AToda Kogyo Corporation · 1994
- Production of cobalt-doped ferrimagnetic iron oxides14US 4,297,395 ABayer Aktiengesellschaft · 1981