G01J 9/00
Measuring optical phase difference
Official title: Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00)
G01J9/00 (Measuring optical phase difference) appears on 1,851 US grants and 1,335 published applications in this corpus.
Search patents in G01J- Granted patents
- 1,851
- Published applications
- 1,335
- Assignees
- 862
- Inventors
- 3,329
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 8 | 0 |
| 1978 | 4 | 0 |
| 1979 | 10 | 0 |
| 1980 | 9 | 0 |
| 1981 | 11 | 0 |
| 1982 | 10 | 0 |
| 1983 | 10 | 0 |
| 1984 | 15 | 0 |
| 1985 | 15 | 0 |
| 1986 | 21 | 0 |
| 1987 | 32 | 0 |
| 1988 | 33 | 0 |
| 1989 | 32 | 0 |
| 1990 | 42 | 0 |
| 1991 | 44 | 0 |
| 1992 | 28 | 0 |
| 1993 | 37 | 0 |
| 1994 | 26 | 0 |
| 1995 | 24 | 0 |
| 1996 | 24 | 0 |
| 1997 | 18 | 0 |
| 1998 | 28 | 0 |
| 1999 | 36 | 0 |
| 2000 | 34 | 0 |
| 2001 | 26 | 6 |
| 2002 | 44 | 73 |
| 2003 | 77 | 76 |
| 2004 | 55 | 69 |
| 2005 | 59 | 76 |
| 2006 | 68 | 78 |
| 2007 | 52 | 61 |
| 2008 | 75 | 52 |
| 2009 | 68 | 48 |
| 2010 | 44 | 39 |
| 2011 | 35 | 43 |
| 2012 | 31 | 41 |
| 2013 | 42 | 42 |
| 2014 | 50 | 51 |
| 2015 | 46 | 57 |
| 2016 | 51 | 45 |
| 2017 | 53 | 51 |
| 2018 | 53 | 51 |
| 2019 | 66 | 56 |
| 2020 | 46 | 51 |
| 2021 | 49 | 44 |
| 2022 | 49 | 53 |
| 2023 | 33 | 57 |
| 2024 | 41 | 47 |
| 2025 | 53 | 38 |
| 2026 | 29 | 30 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01J 9/02Measuring optical phase difference: by interferometric methods992
- G01J 9/04Measuring optical phase difference: by beating two waves of a same source213
- G01J 2009/002Wavefront phase distributionIndexing code67
- G01J 2009/006Measuring optical phase difference: using pulses for physical measurementsIndexing code13
- G01J 2009/004Mode patternIndexing code11
Recent patents
- Optical wavelength measuring device using absorption-type optical fiber-based multiple optical fiber filter module, optical sensor system having the same, and optical measurement method29 Sep 2026US 12,747,989 B2Six Fiber Systems Inc.
- Prism-free differential interference contrast microscope with tunable beam shear distance8 Sep 2026US 12,730,010 B2Board of Regents, The University of Texas System
- Optical self-heterodyne detection system including optical frequency comb light source1 Sep 2026US 12,723,865 B2Electronics and Telecommunications Research Institute
- Metalens array and wavefront sensor system1 Sep 2026US 12,723,925 B2Shenzhen Metalenx Technology Co.,Ltd
- System for inspecting surfaces of an optical wave using a gradient density filter1 Sep 2026US 12,724,176 B2Centre National De La Recherche Scientifique
- Method and systems for tuning coherence in systems1 Oct 2026US 2026/0298722 A1
- Optical element, wavelength detection unit, and light generation unit17 Sep 2026US 2026/0276453 A1Hamamatsu Photonics K.K.
- Optical module10 Sep 2026US 2026/0269564 A1Mitsubishi Electric Corporation
- Laser Phase Noise Measurement using Multi-Laser Interferometry and Sub-Nyquist Sampling27 Aug 2026US 2026/0251506 A1NEC Laboratories America, Inc.
- Blocking element of short wavelengths in led-type light sources20 Aug 2026US 2026/0243936 A1Universidad Complutense De Madrid
Most cited
By later US patents
- Method and apparatus for improving vision and the resolution of retinal images591US 5,777,719 AUniversity of Rochester · 1998
- Method and apparatus for acquiring images using a ccd detector array and no transverse scanner522US 5,465,147 AMassachusetts Institute of Technology · 1995
- Method and apparatus for improving vision and the resolution of retinal images381US 6,095,651 AUniversity of Rochester · 2000
- Arrangement for spectral interferometric optical tomography and surface profile measurement324US 6,377,349 B1Carl Zeiss Jena GmbH · 2002
- Method and apparatus for improving vision and the resolution of retinal images289US 5,949,521 AUniversity of Rochester · 1999