G01N 2021/3527
And using one filter cell as attenuator
Official title: {and using one filter cell as attenuator}
G01N2021/3527 (And using one filter cell as attenuator) appears on 9 US grants and 12 published applications in this corpus.
Search patents in G01N- Granted patents
- 9
- Published applications
- 12
- Assignees
- 10
- Inventors
- 24
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2003 | 0 | 5 |
| 2004 | 4 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 2 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 1 |
By publication year. 2026 runs to 8 Oct.
Recent patents
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- System and method for detecting a given gas species present in a gaseous sample using gas filter correlation spectroscopy20 Jan 2022US 2022/0018771 A1Institut National D'Optique
Most cited
By later US patents
- Optical path structure for open path emissions sensing with spinning filter wheel9US 6,723,990 B2SPX Corporation · 2004
- Optical path structure for open path emissions sensing8US 6,744,516 B2SPX Corporation · 2004
- Optical path structure for open path emissions sensing with particulate matter and lubricating oil consumption absorption methodology7US 6,900,893 B2SPX Corporation · 2005
- Optical path structure for open path emissions sensing with opposed sources5US 6,833,922 B2SPX Corporation · 2004
- Optical path structure for open path emissions sensing with spinning mirror4US 6,744,059 B2SPX Corporation · 2004