G01N 21/3504
For analysing gases
Official title: for analysing gases, e.g. multi-gas analysis
G01N21/3504 (For analysing gases) appears on 2,725 US grants and 2,755 published applications in this corpus.
Search patents in G01N- Granted patents
- 2,725
- Published applications
- 2,755
- Assignees
- 1,354
- Inventors
- 5,461
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 9 | 0 |
| 1978 | 5 | 0 |
| 1979 | 7 | 0 |
| 1980 | 7 | 0 |
| 1981 | 8 | 0 |
| 1982 | 6 | 0 |
| 1983 | 5 | 0 |
| 1984 | 10 | 0 |
| 1985 | 15 | 0 |
| 1986 | 11 | 0 |
| 1987 | 23 | 0 |
| 1988 | 14 | 0 |
| 1989 | 21 | 0 |
| 1990 | 21 | 0 |
| 1991 | 32 | 0 |
| 1992 | 29 | 0 |
| 1993 | 27 | 0 |
| 1994 | 28 | 0 |
| 1995 | 31 | 0 |
| 1996 | 23 | 0 |
| 1997 | 28 | 0 |
| 1998 | 43 | 0 |
| 1999 | 37 | 0 |
| 2000 | 28 | 0 |
| 2001 | 33 | 7 |
| 2002 | 36 | 40 |
| 2003 | 50 | 70 |
| 2004 | 42 | 65 |
| 2005 | 42 | 62 |
| 2006 | 57 | 78 |
| 2007 | 67 | 85 |
| 2008 | 65 | 81 |
| 2009 | 58 | 63 |
| 2010 | 56 | 100 |
| 2011 | 53 | 81 |
| 2012 | 80 | 94 |
| 2013 | 69 | 108 |
| 2014 | 77 | 101 |
| 2015 | 84 | 121 |
| 2016 | 102 | 106 |
| 2017 | 114 | 128 |
| 2018 | 132 | 158 |
| 2019 | 142 | 190 |
| 2020 | 132 | 167 |
| 2021 | 136 | 148 |
| 2022 | 123 | 159 |
| 2023 | 147 | 153 |
| 2024 | 120 | 153 |
| 2025 | 148 | 146 |
| 2026 | 80 | 91 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01N 2021/3513Open path with an instrumental sourceIndexing code212
- G01N 2021/3531Without instrumental source, i.e. radiometricIndexing code156
- G01N 21/3518Devices using gas filter correlation techniques148
- G01N 2021/354Hygrometry of gasesIndexing code41
- G01N 2021/3545Disposition for compensating effect of interfering gasesIndexing code27
- G01N 2021/3536Using modulation of pressure or densityIndexing code19
- G01N 2021/3509Correlation methodIndexing code17
Recent patents
- Time-of-flight measurement on user with cameras and position sensor6 Oct 2026US 12,751,628 B2Omni Medsci, Inc.
- Optical sensor and system6 Oct 2026US 12,754,132 B2The University of Sydney
- Analysis device and analysis method29 Sep 2026US 12,748,043 B2Horiba, Ltd.
- Gas sensor29 Sep 2026US 12,748,044 B2Ashai Kasei Microdevices Corporation
- Leak-detection system and methods for leak detection15 Sep 2026US 12,736,434 B2California Institute of Technology
- Systems and methods for calibrating emissions monitoring equipment1 Oct 2026US 2026/0298814 A1Cemtek Environmental, Inc.
- Optical apparatus, optical inspection apparatus, and optical inspection method24 Sep 2026US 2026/0287499 A1Kabushiki Kaisha Toshiba
- Component mounting method, gas detection apparatus board, and gas detection apparatus system17 Sep 2026US 2026/0276534 A1Asahi Kasei Microdevices Corporation
- Optical gas sensor device17 Sep 2026US 2026/0276535 A1Mitsumi Electric Co., Ltd.
- Method of scanning a lidar system for gas detection17 Sep 2026US 2026/0276824 A1QLM Technology Ltd
Most cited
By later US patents
- Methods for differential image quality enhancement for a multiple detector system, systems and use thereof1,019US 9,471,969 B2ExxonMobil Upstream Research Company · 2016
- Air gas analyzer window and a method for producing such a window494US 7,629,039 B2Phasein AB · 2009
- Method and system for transmitting terahertz pulses257US 7,531,803 B2William Marsh Rice University · 2009
- Method for correcting spectral data for data due to the spectral measurement process itself and estimating unknown property and/or composition data of a sample using such method236US 5,121,337 AExxon Research & Engineering Co. · 1992
- Solid-state spectrometer230US 11,692,934 B2Masimo Corporation · 2023