G01N 31/223
For investigating presence of specific gases or aerosols
Official title: {for investigating presence of specific gases or aerosols (G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10)}
G01N31/223 (For investigating presence of specific gases or aerosols) appears on 505 US grants and 430 published applications in this corpus.
Search patents in G01N- Granted patents
- 505
- Published applications
- 430
- Assignees
- 390
- Inventors
- 1,328
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 9 | 0 |
| 1978 | 7 | 0 |
| 1979 | 5 | 0 |
| 1980 | 5 | 0 |
| 1981 | 15 | 0 |
| 1982 | 9 | 0 |
| 1983 | 4 | 0 |
| 1984 | 7 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 8 | 0 |
| 1989 | 7 | 0 |
| 1990 | 9 | 0 |
| 1991 | 13 | 0 |
| 1992 | 16 | 0 |
| 1993 | 11 | 0 |
| 1994 | 16 | 0 |
| 1995 | 10 | 0 |
| 1996 | 12 | 0 |
| 1997 | 8 | 0 |
| 1998 | 14 | 0 |
| 1999 | 8 | 0 |
| 2000 | 11 | 0 |
| 2001 | 10 | 6 |
| 2002 | 18 | 8 |
| 2003 | 5 | 17 |
| 2004 | 10 | 16 |
| 2005 | 4 | 10 |
| 2006 | 4 | 9 |
| 2007 | 1 | 22 |
| 2008 | 4 | 15 |
| 2009 | 7 | 7 |
| 2010 | 10 | 14 |
| 2011 | 10 | 19 |
| 2012 | 6 | 11 |
| 2013 | 14 | 16 |
| 2014 | 19 | 12 |
| 2015 | 11 | 17 |
| 2016 | 12 | 32 |
| 2017 | 14 | 26 |
| 2018 | 20 | 23 |
| 2019 | 17 | 22 |
| 2020 | 18 | 31 |
| 2021 | 17 | 28 |
| 2022 | 19 | 14 |
| 2023 | 7 | 13 |
| 2024 | 10 | 22 |
| 2025 | 11 | 13 |
| 2026 | 10 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Mitigation of free chlorine interference for ozone detection using an indigo-based indicator29 Sep 2026US 12,748,090 B2Hach Company
- Hydrogel coating composition for chemical sensor and chemical sensor fabricated using same1 Sep 2026US 12,723,159 B2Kookmin University Industry Academy Cooperation Foundation
- Multi-position modular carbon dioxide detector and indicator and methods of use7 Jul 2026US 12,673,150 B2
- Contrast component coating for sensor analysis23 Jun 2026US 12,662,934 B2Halliburton Energy Services.Inc.
- Aerosol concentration sensor calibration device2 Jun 2026US 12,644,814 B2Kidde Technologies, 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
- Contrast component coating for sensor analysis24 Sep 2026US 2026/0286842 A1Halliburton Energy Services.Inc.
- Hydrogen sulfide detecting agent17 Sep 2026US 2026/0276610 A1Nok Corporation
- Visible hydrogen-chromic sensing material, and preparation method and use thereof30 Apr 2026US 2026/0118332 A1Nanjing University
- System and method of quantifying carbon dioxide storage9 Apr 2026US 2026/0098468 A1Resman AS
Most cited
By later US patents
- Sensor device containing mesoporous crystalline material348US 5,364,797 AMobil Oil Corporation · 1994
- Polymeric luminophores for sensing of oxygen280US 5,580,527 AMoltech Corporation · 1996
- Fluorescent reporter beads for fluid analysis224US 5,747,349 AUniversity of Washington · 1998
- Carbon dioxide indicator device185US 4,728,499 A1988
- Oxygen sensing membranes and methods of making same170US 6,190,612 B1Bayer Aktiengesellschaft · 2001