G01N 21/31
Investigating relative effect of material at wavelengths characteristic of specific elements or
Official title: Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry {(G01N21/72 takes precedence)}
G01N21/31 (Investigating relative effect of material at wavelengths characteristic of specific elements or) appears on 12,067 US grants and 13,196 published applications in this corpus.
Search patents in G01N- Granted patents
- 12,067
- Published applications
- 13,196
- Assignees
- 5,395
- Inventors
- 25,905
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 45 | 0 |
| 1977 | 29 | 0 |
| 1978 | 22 | 0 |
| 1979 | 25 | 0 |
| 1980 | 36 | 0 |
| 1981 | 38 | 0 |
| 1982 | 28 | 0 |
| 1983 | 33 | 0 |
| 1984 | 43 | 0 |
| 1985 | 56 | 0 |
| 1986 | 51 | 0 |
| 1987 | 74 | 0 |
| 1988 | 72 | 0 |
| 1989 | 110 | 0 |
| 1990 | 73 | 0 |
| 1991 | 119 | 0 |
| 1992 | 95 | 0 |
| 1993 | 99 | 0 |
| 1994 | 108 | 0 |
| 1995 | 110 | 0 |
| 1996 | 108 | 0 |
| 1997 | 94 | 0 |
| 1998 | 157 | 0 |
| 1999 | 129 | 0 |
| 2000 | 137 | 0 |
| 2001 | 130 | 45 |
| 2002 | 138 | 182 |
| 2003 | 195 | 279 |
| 2004 | 184 | 336 |
| 2005 | 181 | 322 |
| 2006 | 255 | 370 |
| 2007 | 265 | 365 |
| 2008 | 263 | 389 |
| 2009 | 246 | 355 |
| 2010 | 287 | 416 |
| 2011 | 266 | 376 |
| 2012 | 308 | 402 |
| 2013 | 320 | 463 |
| 2014 | 336 | 457 |
| 2015 | 429 | 566 |
| 2016 | 451 | 586 |
| 2017 | 496 | 617 |
| 2018 | 526 | 697 |
| 2019 | 672 | 782 |
| 2020 | 624 | 818 |
| 2021 | 623 | 813 |
| 2022 | 618 | 826 |
| 2023 | 629 | 785 |
| 2024 | 649 | 757 |
| 2025 | 663 | 665 |
| 2026 | 422 | 527 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01N 21/35Using infrared light7,566
- G01N 21/314With comparison of measurements at specific and non-specific wavelengths1,843
- G01N 21/39Using tunable lasers1,461
- G01N 21/33Using ultraviolet light1,171
- G01N 2021/3129Determining multicomponents by multiwavelength lightIndexing code344
- G01N 21/3103Atomic absorption analysis321
- G01N 2021/3196Correlating located peaks in spectrum with reference dataIndexing code55
- G01N 2021/3185Typically monochromatic or band-limitedIndexing code54
All 9 subgroupsShow fewer
Recent patents
- Time-of-flight measurement on user with cameras and position sensor6 Oct 2026US 12,751,628 B2Omni Medsci, Inc.
- Optical sensor and system6 Oct 2026US 12,754,132 B2The University of Sydney
- Composite structure detecting method and system6 Oct 2026US 12,754,142 B2Advanced ACEBIOTEK CO., LTD.
- Analysis apparatus and analysis method6 Oct 2026US 12,755,816 B2NGK Insulators, Ltd.
- Spectrometer method and apparatus29 Sep 2026US 12,747,987 B2Spectricity
- Sample probe8 Oct 2026US 2026/0309590 A1Teknologian tutkimuskeskus VTT Oy
- Nanosecond-scale photothermal dynamic imaging8 Oct 2026US 2026/0309619 A1Trustees of Boston University
- All-Reflective Optical Imaging Spectrometer with Flat Dispersive Element8 Oct 2026US 2026/0309620 A1
- High throughput optical assay for screening hemoglobin oxygen affinity modifying drug8 Oct 2026US 2026/0309621 A1
- Real-time inline milk analysis system and method8 Oct 2026US 2026/0309622 A1
Most cited
By later US patents
- Blood glucose monitoring system1,824US 5,743,262 AMasimo Corporation · 1998
- Method and apparatus using alternative site glucose determinations to calibrate and maintain noninvasive and implantable analyzers1,598US 6,998,247 B2Sensys Medical, Inc. · 2006
- Manual and automatic probe calibration1,429US 5,758,644 AMasimo Corporation · 1998
- Implantable sensor and system for in vivo measurement and control of fluid constituent levels1,362US 6,049,727 AAnimas Corporation · 2000
- Optical filter for spectroscopic measurement and method of producing the optical filter1,209US 5,760,910 AMasimo Corporation · 1998