G11B 5/538
Disposition or mounting of pole pieces on rotating support
Official title: {Disposition or mounting of pole pieces on rotating support (magnetic switching of fixed head arrangements G11B5/49)}
G11B5/538 (Disposition or mounting of pole pieces on rotating support) appears on 6 US grants and 1 published applications in this corpus.
Search patents in G11B- Granted patents
- 6
- Published applications
- 1
- Assignees
- 6
- Inventors
- 19
- Latest grant
- 13 Dec 1988
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Magnetic recording device with rotating head13 Dec 1988US 4,791,514 AThomson-CSF
- Vertical magnetic recording and playback apparatus15 Mar 1988US 4,731,681 AVictor Company of Japan, Ltd.
- Rotary head recording system3 Mar 1987US 4,647,993 AMagnetic Peripherals Inc.
- Video tape recorder including vertical recording heads10 Feb 1987US 4,642,711 AOlympus Optical Co., Ltd.
- Rotary head recording system13 Jan 1987US 4,636,886 AMagnetic Peripherals Inc.
Most cited
By later US patents
- Rotary head recording system17US 4,636,886 AMagnetic Peripherals Inc. · 1987
- Rotary head recording system13US 4,647,993 AMagnetic Peripherals Inc. · 1987
- Vertical magnetic recording and playback apparatus12US 4,731,681 AVictor Company of Japan, Ltd. · 1988
- Video tape recorder including vertical recording heads8US 4,642,711 AOlympus Optical Co., Ltd. · 1987
- Magnetic recording device with rotating head6US 4,791,514 AThomson-CSF · 1988