G01N 31/22
Investigating or analysing non-biological materials by the use of the chemical methods
Official title: using chemical indicators (G01N31/02 takes precedence)
G01N31/22 (Investigating or analysing non-biological materials by the use of the chemical methods) appears on 2,558 US grants and 2,531 published applications in this corpus.
Search patents in G01N- Granted patents
- 2,558
- Published applications
- 2,531
- Assignees
- 1,525
- Inventors
- 6,096
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 27 | 0 |
| 1977 | 28 | 0 |
| 1978 | 23 | 0 |
| 1979 | 13 | 0 |
| 1980 | 25 | 0 |
| 1981 | 44 | 0 |
| 1982 | 22 | 0 |
| 1983 | 17 | 0 |
| 1984 | 22 | 0 |
| 1985 | 21 | 0 |
| 1986 | 21 | 0 |
| 1987 | 28 | 0 |
| 1988 | 38 | 0 |
| 1989 | 34 | 0 |
| 1990 | 33 | 0 |
| 1991 | 44 | 0 |
| 1992 | 42 | 0 |
| 1993 | 49 | 0 |
| 1994 | 49 | 0 |
| 1995 | 42 | 0 |
| 1996 | 42 | 0 |
| 1997 | 31 | 0 |
| 1998 | 53 | 0 |
| 1999 | 51 | 0 |
| 2000 | 44 | 0 |
| 2001 | 35 | 14 |
| 2002 | 48 | 52 |
| 2003 | 40 | 77 |
| 2004 | 45 | 68 |
| 2005 | 21 | 70 |
| 2006 | 29 | 76 |
| 2007 | 30 | 97 |
| 2008 | 30 | 99 |
| 2009 | 41 | 77 |
| 2010 | 66 | 90 |
| 2011 | 57 | 106 |
| 2012 | 76 | 86 |
| 2013 | 74 | 94 |
| 2014 | 83 | 103 |
| 2015 | 81 | 114 |
| 2016 | 91 | 145 |
| 2017 | 86 | 106 |
| 2018 | 107 | 134 |
| 2019 | 91 | 132 |
| 2020 | 101 | 161 |
| 2021 | 98 | 162 |
| 2022 | 106 | 113 |
| 2023 | 90 | 121 |
| 2024 | 52 | 96 |
| 2025 | 75 | 84 |
| 2026 | 62 | 54 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01N 31/223For investigating presence of specific gases or aerosols505
- G01N 31/221For investigating ph value337
- G01N 31/229For investigating time/temperature history188
- G01N 31/226For investigating the degree of sterilisation175
- G01N 31/222For investigating moisture content134
- G01N 31/228For peroxides65
- G01N 31/227For nitrates or nitrites38
Recent patents
- Mitigation of free chlorine interference for ozone detection using an indigo-based indicator29 Sep 2026US 12,748,090 B2Hach Company
- Reducing member, analysis device, and analysis method22 Sep 2026US 12,742,757 B2Bl Tec K.K.
- Hydrogel coating composition for chemical sensor and chemical sensor fabricated using same1 Sep 2026US 12,723,159 B2Kookmin University Industry Academy Cooperation Foundation
- Chromium VI test1 Sep 2026US 12,723,987 B2Matinspired B.V.
- Quantitative chirality and concentration sensing of chiral analytes using a relay assay1 Sep 2026US 12,724,014 B2Georgetown University
- 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
- Contrast component coating for sensor analysis24 Sep 2026US 2026/0286842 A1Halliburton Energy Services.Inc.
- High and low frequency soil and plant analysis systems with integrated measurements17 Sep 2026US 2026/0271821 A1Precision Planting LLC
- Hydrogen sulfide detecting agent17 Sep 2026US 2026/0276610 A1Nok Corporation
- Compositions and assays for opioid detection3 Sep 2026US 2026/0259185 A1Trustees of Tufts College
Most cited
By later US patents
- Transdermal dosimeter and method of use488US 4,595,011 A1986
- Element, structure and method for the analysis or transport of liquids417US 4,258,001 AEastman Kodak Company · 1981
- Color changing device for monitoring shelf-life of perishable products367US 5,053,339 AJ P Labs Inc. · 1991
- Sensor device containing mesoporous crystalline material348US 5,364,797 AMobil Oil Corporation · 1994
- Fiber optic pH probe338US 4,200,110 AUnited States of America · 1980