G01N 21/78
Producing a change of colour
Official title: producing a change of colour
G01N21/78 (Producing a change of colour) appears on 2,751 US grants and 3,886 published applications in this corpus.
Search patents in G01N- Granted patents
- 2,751
- Published applications
- 3,886
- Assignees
- 1,828
- Inventors
- 8,365
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 9 | 0 |
| 1986 | 5 | 0 |
| 1987 | 13 | 0 |
| 1988 | 11 | 0 |
| 1989 | 23 | 0 |
| 1990 | 20 | 0 |
| 1991 | 23 | 0 |
| 1992 | 32 | 0 |
| 1993 | 25 | 0 |
| 1994 | 33 | 0 |
| 1995 | 26 | 0 |
| 1996 | 23 | 0 |
| 1997 | 22 | 0 |
| 1998 | 20 | 0 |
| 1999 | 12 | 0 |
| 2000 | 13 | 0 |
| 2001 | 14 | 4 |
| 2002 | 15 | 26 |
| 2003 | 21 | 47 |
| 2004 | 20 | 46 |
| 2005 | 11 | 60 |
| 2006 | 21 | 56 |
| 2007 | 28 | 79 |
| 2008 | 33 | 98 |
| 2009 | 23 | 101 |
| 2010 | 42 | 100 |
| 2011 | 59 | 113 |
| 2012 | 86 | 138 |
| 2013 | 78 | 149 |
| 2014 | 99 | 165 |
| 2015 | 148 | 182 |
| 2016 | 125 | 241 |
| 2017 | 153 | 216 |
| 2018 | 156 | 217 |
| 2019 | 175 | 247 |
| 2020 | 162 | 256 |
| 2021 | 164 | 294 |
| 2022 | 214 | 262 |
| 2023 | 181 | 232 |
| 2024 | 136 | 206 |
| 2025 | 144 | 203 |
| 2026 | 101 | 148 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Occult blood detection film, and preparation method therefor and use thereof and occult blood detection kit6 Oct 2026US 12,754,190 B2Ankon Medical Technologies (Shanghai) Co., LTD.
- Microfluidic detection strip chip and preparation and method thereof29 Sep 2026US 12,746,543 B2Xiamen Brana Design Co., Ltd.
- Rapid testing mechanism and method for respiratory viral pathogens29 Sep 2026US 12,748,100 B2
- Optical detector for detecting gas and suspended matter22 Sep 2026US 12,742,681 B2
- Chromatographic strip support tool and method for using same22 Sep 2026US 12,742,736 B2Kaneka Corporation
- Cartridge providing real-time colorimetric detection and/or turbidimetric detection of microorganisms via image capture on a mobile device8 Oct 2026US 2026/0309632 A1Seethru Diagnostics, LLC
- Methods and kits for rapid, colorimetric beryllium detection8 Oct 2026US 2026/0309633 A1Consolidated Nuclear Security, LLC
- Opioid Detection Wipes8 Oct 2026US 2026/0309634 A1Rockline Industries, Inc.
- Meltable color changeable indicators with organic polymer cores and methods of making such meltable indicators and composites thereof1 Oct 2026US 2026/0298832 A1Thermographic Measurements Ltd
- Chloride measurement with silver, 2,4,6-tripyridyl-s-triazine and iron (ii) titration1 Oct 2026US 2026/0298895 A1Hach Company
Most cited
By later US patents
- Fiber-optic physiological probes732US 4,925,268 AAbbott Laboratories · 1990
- Sensors for continuous monitoring of biochemicals and related method529US 6,256,522 B1University of Pittsburgh—Of the Commonwealth System of Higher Education · 2001
- Optical analyzer455US 5,029,583 APersonal Diagnostics, Inc. · 1991
- Fiber optic pH probe338US 4,200,110 AUnited States of America · 1980
- Reservoir chemical sensors308US 5,116,759 AFiberChem Inc. · 1992