G11B 15/14
Masking or switching periodically
Official title: Masking or switching periodically, e.g. of rotating heads
G11B15/14 (Masking or switching periodically) appears on 164 US grants and 12 published applications in this corpus.
Search patents in G11B- Granted patents
- 164
- Published applications
- 12
- Assignees
- 42
- Inventors
- 266
- Latest grant
- 2 Sep 2008
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 8 | 0 |
| 1985 | 3 | 0 |
| 1986 | 10 | 0 |
| 1987 | 12 | 0 |
| 1988 | 3 | 0 |
| 1989 | 8 | 0 |
| 1990 | 8 | 0 |
| 1991 | 7 | 0 |
| 1992 | 8 | 0 |
| 1993 | 5 | 0 |
| 1994 | 12 | 0 |
| 1995 | 8 | 0 |
| 1996 | 2 | 0 |
| 1997 | 7 | 0 |
| 1998 | 9 | 0 |
| 1999 | 7 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 4 |
| 2002 | 3 | 1 |
| 2003 | 2 | 3 |
| 2004 | 3 | 4 |
| 2005 | 1 | 0 |
| 2006 | 4 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Head system, recording and reproduction system, and magnetic recording method2 Sep 2008US 7,420,758 B2Sony Corporation
- Method and apparatus for maintaining consistent track pitch in helical scan recorder12 Sep 2006US 7,106,535 B2Exabyte Corporation
- Rotary drum and magnetic reproducing apparatus or magnetic recording and reproducing apparatus using the same25 Jul 2006US 7,082,015 B2Sony Corporation
- Recording/reproducing apparatus4 Apr 2006US 7,023,635 B2Hitachi, Ltd.
- Alternating-azimuth angle helical track format using grouped same-azimuth angle heads10 Jan 2006US 6,985,323 B2Exabyte Corporation
- Head system, recording and reproduction system, and magnetic recording method21 Oct 2004US 2004/0207941 A1Sony Corporation
- Magnetic recording head, rotary drum unit, and magnetic recording/reproducing method and apparatus using the same7 Oct 2004US 2004/0196583 A1
- Recording/reproducing apparatus2 Sep 2004US 2004/0169952 A1Hitachi, Ltd.
- Dynamic head switch timing recalibration apparatus and method5 Aug 2004US 2004/0150904 A1Seagate Technology LLC
- Method and apparatus for maintaining consistent track pitch in helical scan recorder25 Dec 2003US 2003/0234998 A1Exabyte Corporation
Most cited
By later US patents
- Magnetic transducer head assembly with support system therefor57US 4,642,716 ASony Corporation · 1987
- Magnetic tape recording and reproducing arrangements29US 4,484,236 ASony Corporation · 1984
- Magnetic reading device with read head matrix network29US 5,282,104 AThomson-CSF · 1994
- Apparatus for recording and reproducing video signals at selectable different tape traveling speeds from a plurality of pairs of video heads23US 4,293,880 AVictor Company of Japan, Ltd. · 1981
- Rotating head type magnetic record/reproduce apparatus23US 4,628,373 AHitachi, Ltd. · 1986