G01J 9/04
Measuring optical phase difference: by beating two waves of a same source
Official title: by beating two waves of a same source but of different frequency and measuring the phase shift of the lower frequency obtained
G01J9/04 (Measuring optical phase difference: by beating two waves of a same source) appears on 213 US grants and 130 published applications in this corpus.
Search patents in G01J- Granted patents
- 213
- Published applications
- 130
- Assignees
- 147
- Inventors
- 411
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 6 | 0 |
| 1986 | 4 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 11 | 0 |
| 1990 | 15 | 0 |
| 1991 | 8 | 0 |
| 1992 | 6 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 3 |
| 2003 | 4 | 8 |
| 2004 | 3 | 5 |
| 2005 | 5 | 7 |
| 2006 | 5 | 6 |
| 2007 | 3 | 12 |
| 2008 | 9 | 6 |
| 2009 | 10 | 4 |
| 2010 | 3 | 2 |
| 2011 | 2 | 6 |
| 2012 | 5 | 5 |
| 2013 | 4 | 8 |
| 2014 | 7 | 5 |
| 2015 | 6 | 3 |
| 2016 | 5 | 5 |
| 2017 | 6 | 5 |
| 2018 | 7 | 6 |
| 2019 | 3 | 3 |
| 2020 | 4 | 4 |
| 2021 | 3 | 6 |
| 2022 | 5 | 2 |
| 2023 | 3 | 5 |
| 2024 | 1 | 8 |
| 2025 | 8 | 3 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Examination of biological tissue using frequency domain spectroscopy280US 5,553,614 ANon-Invasive Technology, Inc. · 1996
- Phase modulated spectrophotometry251US 4,972,331 ANIM Incorporated · 1990
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- Phase modulation spectrophotometric apparatus215US 6,708,048 B1Non-Invasive Technology, Inc. · 2004
- Phase modulation spectroscopic system156US 5,187,672 ANIM Incorporated · 1993