G11B 7/0916
Foucault or knife-edge methods
Official title: {Foucault or knife-edge methods}
G11B7/0916 (Foucault or knife-edge methods) appears on 222 US grants and 69 published applications in this corpus.
Search patents in G11B- Granted patents
- 222
- Published applications
- 69
- Assignees
- 64
- Inventors
- 324
- Latest grant
- 21 Oct 2014
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 18 | 0 |
| 1988 | 6 | 0 |
| 1989 | 14 | 0 |
| 1990 | 10 | 0 |
| 1991 | 11 | 0 |
| 1992 | 15 | 0 |
| 1993 | 10 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 9 | 0 |
| 1998 | 16 | 0 |
| 1999 | 7 | 0 |
| 2000 | 9 | 0 |
| 2001 | 8 | 7 |
| 2002 | 11 | 10 |
| 2003 | 4 | 4 |
| 2004 | 6 | 4 |
| 2005 | 7 | 9 |
| 2006 | 8 | 8 |
| 2007 | 3 | 6 |
| 2008 | 3 | 3 |
| 2009 | 2 | 3 |
| 2010 | 0 | 4 |
| 2011 | 5 | 5 |
| 2012 | 2 | 1 |
| 2013 | 5 | 5 |
| 2014 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Optical pickup apparatus having diffractive element for focusing and tracking plurality of light types21 Oct 2014US 8,867,325 B2Sharp Kabushiki Kaisha
- Optical pickup device and optical disc apparatus1 Oct 2013US 8,547,815 B2Hitachi Media Electronics Co., Ltd.
- Optical pickup device and optical disc apparatus10 Sep 2013US 8,531,930 B2Hitachi Media Electronics Co., Ltd.
- Displacement detection device and method20 Aug 2013US 8,514,410 B2Kabushiki Kaisha Toshiba
- Optical pickup device and optical read/write apparatus28 May 2013US 8,451,700 B2Panasonic Corporation
- Displacement detection device and method11 Jul 2013US 2013/0176576 A1Kabushiki Kaisha Toshiba
- Optical Pickup11 Jul 2013US 2013/0176840 A1Hitachi Media Electronics Co., Ltd.
- Optical pickup device and optical read/write apparatus4 Apr 2013US 2013/0083641 A1Panasonic Corporation
- Optical pickup device and optical disc apparatus17 Jan 2013US 2013/0016599 A1Hitachi Media Electronics Co., Ltd.
- Optical pickup apparatus10 Jan 2013US 2013/0010178 A1Sharp Kabusshiki Kaisha
Most cited
By later US patents
- Method, apparatus and record carrier body for optically writing information96US 4,363,116 AU. S. Philips Corporation · 1982
- Optical head comprising a diffraction grating for directing two or more diffracted beams to optical detectors75US 4,945,529 ANEC Corporation · 1990
- Optical recording medium having two separate recording layers68US 5,764,619 AMatsushita Electric Industrial Co., Ltd. · 1998
- Optical reproducing head51US 4,458,980 ASony Corporation · 1984
- Focus tracking registration for optical reproducing systems48US 3,932,700 AZenith Radio Corporation · 1976