G02F 2/02
Frequency-changing of light
Official title: Frequency-changing of light, e.g. by quantum counters
G02F2/02 (Frequency-changing of light) appears on 262 US grants and 228 published applications in this corpus.
Search patents in G02F- Granted patents
- 262
- Published applications
- 228
- Assignees
- 194
- Inventors
- 623
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 6 | 0 |
| 1993 | 5 | 0 |
| 1994 | 5 | 0 |
| 1995 | 1 | 0 |
| 1996 | 7 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 11 |
| 2003 | 8 | 8 |
| 2004 | 7 | 12 |
| 2005 | 8 | 6 |
| 2006 | 9 | 3 |
| 2007 | 3 | 4 |
| 2008 | 3 | 4 |
| 2009 | 2 | 8 |
| 2010 | 8 | 10 |
| 2011 | 5 | 5 |
| 2012 | 6 | 6 |
| 2013 | 8 | 7 |
| 2014 | 6 | 11 |
| 2015 | 7 | 9 |
| 2016 | 9 | 15 |
| 2017 | 7 | 11 |
| 2018 | 10 | 21 |
| 2019 | 23 | 18 |
| 2020 | 13 | 17 |
| 2021 | 13 | 10 |
| 2022 | 11 | 7 |
| 2023 | 10 | 11 |
| 2024 | 6 | 4 |
| 2025 | 6 | 3 |
| 2026 | 3 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Interferometric resonator optical gyroscope with optical frequency comb5 May 2026US 12,618,674 B2Honeywell International Inc.
- Ultrafast detector of rydberg atoms5 May 2026US 12,618,884 B2Massachusetts Institute of Technology
- Optical comb generation device17 Mar 2026US 12,578,617 B2Suzhou Hyc Technology Co., Ltd.
- Electro-optomechanical quantum transduction7 Oct 2025US 12,436,444 B2International Business Machines Corporation
- Quantum wavelength converter between a microwave signal and an optical signal1 Jul 2025US 12,346,001 B2Qphox B.V.
- Dual comb generating apparatus and spectroscopy system including the same23 Jul 2026US 2026/0210850 A1Electronics and Telecommunications Research Institute
- Production method for optical upconversion organic film, optical upconversion organic film production device, and optical upconversion organic film16 Jul 2026US 2026/0201245 A1Idemitsu Kosan Co., Ltd.
- Display and Display Arrangement Comprising an Upconversion Material in Conjunction with a Photochromic and/or Photoelectrochromic Material16 Jul 2026US 2026/0202692 A1
- Frequency Down-Conversion Device and Communication Device23 Apr 2026US 2026/0110944 A1Tohok Uuniversity
- Interferometric resonator optical gyroscope with optical frequency comb5 Mar 2026US 2026/0063422 A1Honeywell International Inc.
Most cited
By later US patents
- Flat-panel display137US 6,870,671 B2Cambridge 3D Display Limited · 2005
- Manganese doped upconversion luminescence nanoparticles136US 7,008,559 B2Nomadics, Inc. · 2006
- Wide bandwidth solid state optical source130US 5,208,462 AAllied-Signal Inc. · 1993
- Display medium using emitting particles dispersed in a transparent host112US 6,327,074 B1University of Central Florida · 2001
- System and method for a transparent color image display utilizing fluorescence conversion of nano particles and molecules110US 7,090,355 B2Superimaging, Inc. · 2006