G01N 31/224
For investigating presence of dangerous gases
Official title: {for investigating presence of dangerous gases}
G01N31/224 (For investigating presence of dangerous gases) appears on 160 US grants and 131 published applications in this corpus.
Search patents in G01N- Granted patents
- 160
- Published applications
- 131
- Assignees
- 135
- Inventors
- 421
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 9 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 2 |
| 2002 | 3 | 3 |
| 2003 | 1 | 1 |
| 2004 | 1 | 2 |
| 2005 | 1 | 1 |
| 2006 | 1 | 4 |
| 2007 | 0 | 6 |
| 2008 | 1 | 3 |
| 2009 | 2 | 3 |
| 2010 | 3 | 4 |
| 2011 | 4 | 6 |
| 2012 | 0 | 3 |
| 2013 | 4 | 10 |
| 2014 | 6 | 6 |
| 2015 | 8 | 8 |
| 2016 | 5 | 11 |
| 2017 | 7 | 4 |
| 2018 | 4 | 7 |
| 2019 | 5 | 7 |
| 2020 | 6 | 12 |
| 2021 | 6 | 8 |
| 2022 | 7 | 5 |
| 2023 | 1 | 4 |
| 2024 | 2 | 6 |
| 2025 | 4 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Optical detection chip and optical detection system12 May 2026US 12,625,082 B2The University of Kitakyushu
- System and method for tracking of chemical exposures10 Mar 2026US 12,571,782 B2Volatile Analysis Corporation
- Analytical process for detecting peroxide-, nitrate-, nitramine-, and nitrotoluene-based explosives7 Oct 2025US 12,436,135 B2Christian-Albrechts-Universität zu Kiel
- Passive chronometric tamper-indicating device and method26 Aug 2025US 12,399,163 B2Consolidated Nuclear Security, LLC
- Formaldehyde detecting device27 May 2025US 12,313,557 B2National Taiwan Normal University
- Hydrogen sulfide detecting agent17 Sep 2026US 2026/0276610 A1Nok Corporation
- Analytical process for detecting peroxide-, halogen oxoanion-, and nitrate-based explosives29 Jan 2026US 2026/0029389 A1Christian-Albrechts-Universität zu Kiel
- Alkene detection of ozone23 Oct 2025US 2025/0327741 A1Hach Company
- Hydrogen sulfide test kit and method for detecting hydrogen sulfide in an aqueous sample3 Jul 2025US 2025/0216367 A1Hach Company
- Process for detecting amine-type compounds in water and air compartments15 May 2025US 2025/0155366 A1Centre National De La Recherche Scientifique
Most cited
By later US patents
- Hazardous atmosphere badge77US 4,205,043 A1980
- Monitoring system based on etching of metals66US 8,343,437 B2JP Laboratories, Inc. · 2013
- Respirator cartridge end-of-service lift indicator system and method of making61US 4,154,586 AAmerican Optical Corporation · 1979
- Sensing system61US 7,335,526 B2Hewlett-Packard Development Company, L. P. · 2008
- Respirator cartridge end-of-service life indicator58US 4,530,706 AAmerican Optical Corporation · 1985