G03H 2240/21
Optical density variations
G03H2240/21 (Optical density variations) appears on 22 US grants and 28 published applications in this corpus.
Search patents in G03H- Granted patents
- 22
- Published applications
- 28
- Assignees
- 21
- Inventors
- 71
- Latest grant
- 15 Aug 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 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 | 0 |
| 2007 | 0 | 2 |
| 2008 | 1 | 2 |
| 2009 | 0 | 1 |
| 2010 | 3 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 2 | 2 |
| 2014 | 2 | 1 |
| 2015 | 0 | 2 |
| 2016 | 0 | 2 |
| 2017 | 2 | 2 |
| 2018 | 2 | 3 |
| 2019 | 3 | 2 |
| 2020 | 2 | 2 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Graded pore structure without phase mask15 Aug 2023US 11,726,236 B2The Board of Trustees of the University of Illinois
- Fabrication of metallic optical metasurfaces6 Apr 2021US 10,968,522 B2Elwha LLC
- System, apparatus and method for extracting three-dimensional information of an object from received electromagnetic radiation8 Dec 2020US 10,859,977 B2Celloptic, Inc.
- Ultra-thin color phase hologram with metasurfaces25 Aug 2020US 10,754,295 B2Purdue Research Foundation
- System, apparatus and method for extracting three-dimensional information of an object from received electromagnetic radiation13 Aug 2019US 10,379,493 B2Celloptic, Inc.
- Holographic Light Curtains3 Jul 2025US 2025/0216814 A1Carnegie Mellon University
- System and method for generating holographic optical images in curable material26 Jun 2025US 2025/0208566 A1
- Graded pore structure without phase mask9 Feb 2023US 2023/0044343 A1The Board of Trustees of the University of Illinois
- System, apparatus and method for extracting three-dimensional information of an object from received electromagnetic radiation22 Apr 2021US 2021/0116865 A1Celloptic, Inc.
- Spatial deposition of resins with different functionality on different substrates12 Nov 2020US 2020/0355862 A1Facebook Technologies, LLC
Most cited
By later US patents
- Sensitization of photo-thermo-refractive glass to visible radiation by two-step illumination32US 7,326,500 B1University of Central Florida Research Foundation, Inc. · 2008
- Multicolor hologram and method for forming same19US 4,244,633 AMinnesota Mining and Manufacturing Company · 1981
- Fabrication of metallic optical metasurfaces12US 10,968,522 B2Elwha LLC · 2021
- Directional light filter and holographic projector system for its production12US 5,642,209 A1997
- Master hologram and micropattern replication method10US 5,059,499 A1991