G01N 21/25
Colour
Official title: Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
G01N21/25 (Colour) appears on 17,018 US grants and 18,706 published applications in this corpus.
Search patents in G01N- Granted patents
- 17,018
- Published applications
- 18,706
- Assignees
- 7,072
- Inventors
- 36,040
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 84 | 0 |
| 1977 | 66 | 0 |
| 1978 | 53 | 0 |
| 1979 | 35 | 0 |
| 1980 | 56 | 0 |
| 1981 | 59 | 0 |
| 1982 | 47 | 0 |
| 1983 | 51 | 0 |
| 1984 | 65 | 0 |
| 1985 | 85 | 0 |
| 1986 | 72 | 0 |
| 1987 | 101 | 0 |
| 1988 | 98 | 0 |
| 1989 | 145 | 0 |
| 1990 | 103 | 0 |
| 1991 | 158 | 0 |
| 1992 | 139 | 0 |
| 1993 | 140 | 0 |
| 1994 | 156 | 0 |
| 1995 | 154 | 0 |
| 1996 | 143 | 0 |
| 1997 | 125 | 0 |
| 1998 | 205 | 0 |
| 1999 | 177 | 0 |
| 2000 | 176 | 0 |
| 2001 | 188 | 64 |
| 2002 | 206 | 296 |
| 2003 | 276 | 420 |
| 2004 | 256 | 483 |
| 2005 | 267 | 530 |
| 2006 | 370 | 570 |
| 2007 | 414 | 537 |
| 2008 | 370 | 567 |
| 2009 | 369 | 524 |
| 2010 | 425 | 591 |
| 2011 | 390 | 547 |
| 2012 | 435 | 547 |
| 2013 | 447 | 694 |
| 2014 | 488 | 690 |
| 2015 | 588 | 831 |
| 2016 | 637 | 870 |
| 2017 | 717 | 892 |
| 2018 | 775 | 980 |
| 2019 | 962 | 1099 |
| 2020 | 888 | 1130 |
| 2021 | 882 | 1122 |
| 2022 | 845 | 1110 |
| 2023 | 833 | 1042 |
| 2024 | 863 | 1017 |
| 2025 | 882 | 868 |
| 2026 | 552 | 685 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01N 21/31Investigating relative effect of material at wavelengths characteristic of specific elements or12,067
- G01N 21/27Using photo-electric detection3,423
- G01N 21/251Colorimeters1,754
- G01N 21/255Details1,441
- G01N 21/29Using visual detection233
- G01N 2021/258Surface plasmon spectroscopyIndexing code66
- G01N 21/256Arrangements using two alternating lights and one detector25
Recent patents
- Time-of-flight measurement on user with cameras and position sensor6 Oct 2026US 12,751,628 B2Omni Medsci, Inc.
- Systems and methods for determining presence and/or characteristics of target analytes in a sample6 Oct 2026US 12,752,273 B2Conservation X Labs, Inc
- Raman spectroscopy method and apparatus6 Oct 2026US 12,754,131 B2The University Court of the University of Edinburgh
- 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.
- 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
- Large scale photolithographic solid phase synthesis of polypeptides and receptor binding screening thereof1,998US 5,143,854 AAffymax Technologies N.V. · 1992
- 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
- Array of oligonucleotides on a solid substrate1,585US 5,445,934 AAffymax Technologies N.V. · 1995
- Manual and automatic probe calibration1,429US 5,758,644 AMasimo Corporation · 1998