G01N 33/1853
Hardness of water
Official title: {Hardness of water}
G01N33/1853 (Hardness of water) appears on 64 US grants and 81 published applications in this corpus.
Search patents in G01N- Granted patents
- 64
- Published applications
- 81
- Assignees
- 49
- Inventors
- 201
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 4 |
| 2004 | 2 | 2 |
| 2005 | 1 | 2 |
| 2006 | 1 | 1 |
| 2007 | 1 | 2 |
| 2008 | 1 | 2 |
| 2009 | 0 | 0 |
| 2010 | 2 | 2 |
| 2011 | 2 | 2 |
| 2012 | 2 | 0 |
| 2013 | 1 | 2 |
| 2014 | 0 | 2 |
| 2015 | 3 | 3 |
| 2016 | 1 | 2 |
| 2017 | 3 | 5 |
| 2018 | 1 | 2 |
| 2019 | 3 | 5 |
| 2020 | 2 | 7 |
| 2021 | 6 | 4 |
| 2022 | 5 | 4 |
| 2023 | 3 | 7 |
| 2024 | 3 | 6 |
| 2025 | 6 | 10 |
| 2026 | 4 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and apparatus for determining hardness of raw water of water softening device1 Sep 2026US 12,724,019 B2Foshan Midea Chungho Water Purification Equipment Co., Ltd.
- Water test paper and multifunctional detection test kit30 Jun 2026US 12,669,442 B2
- Electrochemical cell stirring17 Mar 2026US 12,578,303 B2Hach Company
- Multifunctional detection test paper and preparing method thereof27 Jan 2026US 12,535,426 B2
- Drinking water supply system with drinking water quality monitoring function, method for controlling same, and computer program30 Dec 2025US 12,509,864 B2Viega Technology GmbH & Co. KG
- Detection and monitoring of scale formation in fluid mixtures30 Jul 2026US 2026/0219183 A1King Fahd University of Petroleum and Minerals
- Water quality platform and cosmetic ecosystem30 Jul 2026US 2026/0219254 A1L'oreal
- Multifunctional Detection Test Paper and Preparing Method Thereof7 May 2026US 2026/0126395 A1
- Water monitoring system with calcium hardness measurement5 Mar 2026US 2026/0062318 A1Zodiac Pool Systems LLC
- System and method for in-line optical sensing of hydrogen peroxide5 Mar 2026US 2026/0063550 A1CardioQuip, LLC
Most cited
By later US patents
- Apparatus for discharging water with passage selection sensor123US 5,171,429 AInax Corporation · 1992
- Monitoring boiler internal treatment with fluorescent-tagged polymers40US 5,736,405 ANalco Chemical Company · 1998
- Method and apparatus for measuring scaling capacity of calcium oxalate solutions using an electrochemically controlled pH change in the solution proximate to a piezoelectric microbalance27US 6,375,829 B1Nalco Chemical Company · 2002
- Hardness indicator composition and method of water hardness analysis26US 6,599,748 B1Miura Co., Ltd. · 2003
- Feed back control deposit inhibitor dosage optimization system23US 5,360,549 ANalco Chemical Company · 1994