G01N 31/221
For investigating ph value
Official title: {for investigating pH value}
G01N31/221 (For investigating ph value) appears on 337 US grants and 282 published applications in this corpus.
Search patents in G01N- Granted patents
- 337
- Published applications
- 282
- Assignees
- 271
- Inventors
- 850
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 5 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 11 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 2 | 0 |
| 1991 | 6 | 0 |
| 1992 | 10 | 0 |
| 1993 | 11 | 0 |
| 1994 | 10 | 0 |
| 1995 | 13 | 0 |
| 1996 | 11 | 0 |
| 1997 | 8 | 0 |
| 1998 | 17 | 0 |
| 1999 | 12 | 0 |
| 2000 | 10 | 0 |
| 2001 | 3 | 1 |
| 2002 | 3 | 4 |
| 2003 | 4 | 3 |
| 2004 | 3 | 2 |
| 2005 | 1 | 5 |
| 2006 | 1 | 5 |
| 2007 | 3 | 3 |
| 2008 | 2 | 6 |
| 2009 | 2 | 4 |
| 2010 | 4 | 4 |
| 2011 | 1 | 6 |
| 2012 | 4 | 12 |
| 2013 | 4 | 10 |
| 2014 | 6 | 9 |
| 2015 | 12 | 13 |
| 2016 | 12 | 20 |
| 2017 | 7 | 15 |
| 2018 | 16 | 32 |
| 2019 | 15 | 15 |
| 2020 | 20 | 22 |
| 2021 | 8 | 21 |
| 2022 | 12 | 14 |
| 2023 | 8 | 26 |
| 2024 | 7 | 17 |
| 2025 | 12 | 8 |
| 2026 | 16 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Method for determining the acidity of an acidic aqueous solution21 Jul 2026US 12,687,530 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Method for the energy-saving, continuous measuring of a quality of a liquid and measuring device for carrying out the method14 Jul 2026US 12,680,998 B2S::Can GmbH
- Water test paper and multifunctional detection test kit30 Jun 2026US 12,669,442 B2
- Monitoring system and monitoring method5 May 2026US 12,618,814 B2Mitsubishi Heavy Industries, Ltd.
- Reactive gel material for sustained water-based reactions20 Aug 2026US 2026/0242632 A1
- Indicators to indicate the degree of depolymerisation30 Jul 2026US 2026/0217908 A1B4Plastics
- 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
- Measuring device and method for quantitative chemical analysis16 Apr 2026US 2026/0104348 A1SAFECHEM Europe GmbH
Most cited
By later US patents
- Sensor device containing mesoporous crystalline material348US 5,364,797 AMobil Oil Corporation · 1994
- Fiber optic pH probe338US 4,200,110 AUnited States of America · 1980
- Fluorescent reporter beads for fluid analysis224US 5,747,349 AUniversity of Washington · 1998
- Non-bleeding indicator and dyes therefor149US 4,029,598 AE. Merck A. G. · 1977
- Method for producing improved sensor117US 5,783,054 AAustralian Membrane and Biotechnology Research Institute · 1998