G05D 21/00
Control of chemical or physico-chemical variables
Official title: Control of chemical or physico-chemical variables, e.g. pH value
G05D21/00 (Control of chemical or physico-chemical variables) appears on 501 US grants and 343 published applications in this corpus.
Search patents in G05D- Granted patents
- 501
- Published applications
- 343
- Assignees
- 348
- Inventors
- 1,066
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 10 | 0 |
| 1978 | 14 | 0 |
| 1979 | 6 | 0 |
| 1980 | 13 | 0 |
| 1981 | 11 | 0 |
| 1982 | 11 | 0 |
| 1983 | 10 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 7 | 0 |
| 1987 | 7 | 0 |
| 1988 | 4 | 0 |
| 1989 | 8 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 9 | 0 |
| 1993 | 13 | 0 |
| 1994 | 19 | 0 |
| 1995 | 15 | 0 |
| 1996 | 12 | 0 |
| 1997 | 10 | 0 |
| 1998 | 9 | 0 |
| 1999 | 4 | 0 |
| 2000 | 12 | 0 |
| 2001 | 5 | 1 |
| 2002 | 10 | 10 |
| 2003 | 15 | 6 |
| 2004 | 1 | 8 |
| 2005 | 5 | 11 |
| 2006 | 8 | 10 |
| 2007 | 1 | 8 |
| 2008 | 4 | 4 |
| 2009 | 7 | 11 |
| 2010 | 3 | 19 |
| 2011 | 15 | 6 |
| 2012 | 9 | 16 |
| 2013 | 14 | 13 |
| 2014 | 4 | 14 |
| 2015 | 10 | 9 |
| 2016 | 6 | 12 |
| 2017 | 9 | 27 |
| 2018 | 13 | 16 |
| 2019 | 23 | 19 |
| 2020 | 15 | 19 |
| 2021 | 16 | 27 |
| 2022 | 19 | 27 |
| 2023 | 12 | 19 |
| 2024 | 25 | 16 |
| 2025 | 13 | 7 |
| 2026 | 13 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for producing a biofuel by steam cracking18 Aug 2026US 12,709,715 B2Europeenne De Biomasse
- Identification of calibration deviations of pH-measuring devices21 Jul 2026US 12,686,844 B2Hoffman-La Roche Inc.
- Methods of blending off transmix into gasoline streams2 Jun 2026US 12,644,064 B2Texon Midstream, LLC
- Monitoring and controlling connected pool devices2 Jun 2026US 12,644,300 B2Pentair Water Pool and Spa, Inc.
- Environmental test equipment for cooperative control of salt spray concentration and relative humidity12 May 2026US 12,625,060 B2China National Electric Apparatus Research Institute Co., Ltd.
- Monitoring and controlling connected pool devices24 Sep 2026US 2026/0286736 A1Pentair Water Pool and Spa, Inc.
- Compositions and methods for microbiological control in a paper machine coating kitchen10 Sep 2026US 2026/0265548 A1Ecolab USA Inc.
- Control system for radiopharmaceuticals10 Sep 2026US 2026/0269041 A1Lantheus Medical Imaging, Inc.
- Lipid nanoparticle production system and method of monitoring and controlling the same27 Aug 2026US 2026/0250883 A1Sartorius Stedim Biotech GmbH
- A method of adjusting oxoacidity14 May 2026US 2026/0135007 A1Seaborg Aps
Most cited
By later US patents
- Automatic chemical monitor and control system238US 5,422,014 A1995
- Telemetry system for water and energy monitoring134US 4,830,757 AThe Mogul Corporation · 1989
- Computerized system for feeding chemicals into water treatment system118US 4,648,043 ABetz Laboratories, Inc. · 1987
- Fluid condition monitoring and controlling system for a metalworking fluid central system116US 5,224,051 ACincinnati Milacron Inc. · 1993
- On-line control of a chemical process plant112US 6,072,576 AExxon Chemical Patents Inc. · 2000