G01N 21/77
By observing the effect on a chemical indicator
Official title: by observing the effect on a chemical indicator
G01N21/77 (By observing the effect on a chemical indicator) appears on 5,447 US grants and 7,049 published applications in this corpus.
Search patents in G01N- Granted patents
- 5,447
- Published applications
- 7,049
- Assignees
- 2,905
- Inventors
- 14,499
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 7 | 0 |
| 1978 | 11 | 0 |
| 1979 | 4 | 0 |
| 1980 | 7 | 0 |
| 1981 | 9 | 0 |
| 1982 | 6 | 0 |
| 1983 | 7 | 0 |
| 1984 | 9 | 0 |
| 1985 | 15 | 0 |
| 1986 | 15 | 0 |
| 1987 | 26 | 0 |
| 1988 | 28 | 0 |
| 1989 | 51 | 0 |
| 1990 | 37 | 0 |
| 1991 | 42 | 0 |
| 1992 | 69 | 0 |
| 1993 | 66 | 0 |
| 1994 | 63 | 0 |
| 1995 | 53 | 0 |
| 1996 | 52 | 0 |
| 1997 | 63 | 0 |
| 1998 | 54 | 0 |
| 1999 | 45 | 0 |
| 2000 | 43 | 0 |
| 2001 | 61 | 21 |
| 2002 | 58 | 88 |
| 2003 | 67 | 127 |
| 2004 | 74 | 128 |
| 2005 | 51 | 147 |
| 2006 | 74 | 163 |
| 2007 | 102 | 174 |
| 2008 | 102 | 226 |
| 2009 | 93 | 232 |
| 2010 | 145 | 261 |
| 2011 | 152 | 261 |
| 2012 | 170 | 266 |
| 2013 | 182 | 275 |
| 2014 | 212 | 297 |
| 2015 | 238 | 305 |
| 2016 | 225 | 378 |
| 2017 | 265 | 353 |
| 2018 | 286 | 347 |
| 2019 | 287 | 398 |
| 2020 | 280 | 427 |
| 2021 | 278 | 481 |
| 2022 | 316 | 419 |
| 2023 | 296 | 374 |
| 2024 | 237 | 341 |
| 2025 | 240 | 330 |
| 2026 | 170 | 230 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01N 21/78Producing a change of colour2,751
- G01N 21/7703Using reagent-clad optical fibres or optical waveguides1,758
- G01N 2021/7769Measurement method of reaction-produced change in sensorIndexing code1,537
- G01N 2021/7756Sensor typeIndexing code444
- G01N 21/82Producing a precipitate or turbidity349
- G01N 2021/7793Sensor comprising plural indicatorsIndexing code136
- G01N 2021/7796Special mountings, packaging of indicatorsIndexing code82
- G01N 2021/775Indicator and selective membraneIndexing code74
All 9 subgroupsShow fewer
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.
- Plasmonic hydrogen detection29 Sep 2026US 12,748,048 B2King's College London
- Mitigation of free chlorine interference for ozone detection using an indigo-based indicator29 Sep 2026US 12,748,090 B2Hach Company
- Rapid testing mechanism and method for respiratory viral pathogens29 Sep 2026US 12,748,100 B2
- 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
- Capillary flow device951US 4,963,498 ABiotrack, Inc. · 1990
- Optical sensor of plasma constituents945US 4,344,438 AThe United States of America as represented by the Department of Health, Education and Welfare · 1982
- Optical-based sensing devices745US 6,330,464 B1Sensors for Medicine and Science, Inc. · 2001
- Fiber-optic physiological probes732US 4,925,268 AAbbott Laboratories · 1990
- Fiber-optic probe for the measurement of fluid parameters729US 5,408,999 AOptex Biomedical, Inc. · 1995