G01N 21/9506
Optical discs
Official title: {Optical discs}
G01N21/9506 (Optical discs) appears on 163 US grants and 121 published applications in this corpus.
Search patents in G01N- Granted patents
- 163
- Published applications
- 121
- Assignees
- 92
- Inventors
- 315
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 9 | 0 |
| 1999 | 8 | 0 |
| 2000 | 7 | 0 |
| 2001 | 5 | 2 |
| 2002 | 2 | 13 |
| 2003 | 10 | 2 |
| 2004 | 7 | 5 |
| 2005 | 2 | 8 |
| 2006 | 9 | 20 |
| 2007 | 13 | 9 |
| 2008 | 8 | 15 |
| 2009 | 7 | 9 |
| 2010 | 7 | 4 |
| 2011 | 8 | 3 |
| 2012 | 3 | 4 |
| 2013 | 2 | 4 |
| 2014 | 3 | 5 |
| 2015 | 3 | 2 |
| 2016 | 2 | 6 |
| 2017 | 3 | 4 |
| 2018 | 4 | 1 |
| 2019 | 3 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 2 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and system for discriminating defects present on a frontside from defects present on a backside of a transparent substrate31 Mar 2026US 12,590,905 B2Unity Semiconductor Corporation
- Optical disc device and recording and reproduction device18 Jun 2024US 12,014,761 B2Panasonic Intellectual Property Management Co., Ltd.
- Dark-field optical inspection device23 Apr 2024US 11,965,834 B2Unity Semiconductor Corporation
- Workpiece holder for utilization in metrology system for measuring workpiece in different orientations25 Apr 2023US 11,635,291 B2Mitutoyo Corporation
- Method and apparatus for inspection of spherical surfaces29 Jun 2021US 11,047,675 B2
- A method and system for discriminating defects present on a frontside from defects present on a backside of a transparent substrate13 Feb 2025US 2025/0052692 A1Unity Semiconductor Corporation
- Optical disc device and recording and reproduction device18 Jan 2024US 2024/0021214 A1Panasonic Intellectual Property Management Co., Ltd.
- Workpiece holder for utilization in metrology system for measuring workpiece in different orientations3 Nov 2022US 2022/0349705 A1Mitutoyo Corporation
- Dark-field optical inspecting device11 Nov 2021US 2021/0349037 A1Unity Semiconductor Corporation
- Method and apparatus for inspection of spherical surfaces3 Dec 2020US 2020/0378755 A1
Most cited
By later US patents
- Surface pit detection system and method72US 4,794,265 AQC Optics, Inc. · 1988
- Test head for optically inspecting workpieces71US 7,184,139 B2Komag, Inc. · 2007
- Method and apparatus for reducing or eliminating stray light in an optical test head71US 7,375,362 B2WD Media, LLC · 2008
- Apparatus and method for detecting defects and dust on a patterned surface69US 4,598,997 ARCA Corporation · 1986
- Robotic system for optically inspecting workpieces69US 7,239,970 B2Komag, Inc. · 2007