G01N 33/1813
Specific cations in water
Official title: {Specific cations in water, e.g. heavy metals}
G01N33/1813 (Specific cations in water) appears on 267 US grants and 301 published applications in this corpus.
Search patents in G01N- Granted patents
- 267
- Published applications
- 301
- Assignees
- 256
- Inventors
- 925
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 10 | 0 |
| 1997 | 5 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 2 |
| 2003 | 1 | 2 |
| 2004 | 3 | 2 |
| 2005 | 1 | 4 |
| 2006 | 0 | 2 |
| 2007 | 1 | 2 |
| 2008 | 0 | 4 |
| 2009 | 0 | 6 |
| 2010 | 2 | 5 |
| 2011 | 5 | 10 |
| 2012 | 6 | 9 |
| 2013 | 1 | 2 |
| 2014 | 5 | 9 |
| 2015 | 7 | 14 |
| 2016 | 6 | 13 |
| 2017 | 11 | 21 |
| 2018 | 14 | 22 |
| 2019 | 18 | 23 |
| 2020 | 20 | 21 |
| 2021 | 23 | 30 |
| 2022 | 16 | 27 |
| 2023 | 16 | 18 |
| 2024 | 20 | 23 |
| 2025 | 20 | 18 |
| 2026 | 10 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems for nanoplastics detection and method of using the same18 Aug 2026US 12,710,367 B2
- Biosensor for water toxicity monitoring11 Aug 2026US 12,704,493 B2National Research Council of Canada
- Siderophore-based biosensors for iron detection14 Jul 2026US 12,680,959 B2Saudi Arabian Oil Company
- Non-reagent chloride analysis in acid copper plating baths7 Jul 2026US 12,674,775 B2KLA Corporation
- Reagentless dissolution and quantification of particulate analyte in a sample via membrane electrolysis16 Jun 2026US 12,656,303 B2University of Cincinnati
- Methods and systems for determining non-triazole corrosion inhibitor concentration in industrial water systems1 Oct 2026US 2026/0298825 A1Chemtreat, Inc.
- Water quality platform and cosmetic ecosystem30 Jul 2026US 2026/0219254 A1L'oreal
- Optical waveguide sensor for detecting heavy metal ions and method of fabricating the same16 Jul 2026US 2026/0202341 A1Vulcan Photonics Sdn. Bhd.
- Electrochemical nano-sensor array/working electrodes for metal detection, methods of producing same and related reagents9 Jul 2026US 2026/0194506 A1Nuclear Research Center
- Integrated Sensing System for Water Quality Monitoring and Management21 May 2026US 2026/0140101 A1Board of Regents, The University of Texas System
Most cited
By later US patents
- Method for monitoring an aqueous flow using selective film237US 6,232,783 B12001
- Apparatus for discharging water with passage selection sensor123US 5,171,429 AInax Corporation · 1992
- Microelectrodes and amperometric assays109US 5,739,039 AEcossensors Limited · 1998
- Benzazolylcoumarin-based ion indicators103US 5,501,980 AMolecular Probes, Inc. · 1996
- Spectrophotometric monitoring of multiple water treatment performance indicators using chemometrics100US 5,242,602 ABiotronics Technology, Inc. · 1993