G01N 21/534
By measuring transmission alone, i.e. determining opacity
Official title: {by measuring transmission alone, i.e. determining opacity}
G01N21/534 (By measuring transmission alone, i.e. determining opacity) appears on 390 US grants and 269 published applications in this corpus.
Search patents in G01N- Granted patents
- 390
- Published applications
- 269
- Assignees
- 304
- Inventors
- 919
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 7 | 0 |
| 1978 | 7 | 0 |
| 1979 | 2 | 0 |
| 1980 | 9 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 12 | 0 |
| 1986 | 5 | 0 |
| 1987 | 18 | 0 |
| 1988 | 6 | 0 |
| 1989 | 4 | 0 |
| 1990 | 9 | 0 |
| 1991 | 7 | 0 |
| 1992 | 10 | 0 |
| 1993 | 6 | 0 |
| 1994 | 7 | 0 |
| 1995 | 9 | 0 |
| 1996 | 6 | 0 |
| 1997 | 4 | 0 |
| 1998 | 9 | 0 |
| 1999 | 8 | 0 |
| 2000 | 9 | 0 |
| 2001 | 5 | 1 |
| 2002 | 4 | 4 |
| 2003 | 4 | 16 |
| 2004 | 14 | 3 |
| 2005 | 6 | 7 |
| 2006 | 3 | 5 |
| 2007 | 3 | 6 |
| 2008 | 6 | 2 |
| 2009 | 1 | 10 |
| 2010 | 4 | 14 |
| 2011 | 7 | 14 |
| 2012 | 9 | 17 |
| 2013 | 16 | 7 |
| 2014 | 12 | 8 |
| 2015 | 10 | 10 |
| 2016 | 5 | 17 |
| 2017 | 13 | 12 |
| 2018 | 10 | 12 |
| 2019 | 16 | 18 |
| 2020 | 9 | 11 |
| 2021 | 15 | 21 |
| 2022 | 8 | 8 |
| 2023 | 9 | 14 |
| 2024 | 12 | 13 |
| 2025 | 13 | 11 |
| 2026 | 3 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Calibration vessel and method for calibration31 Mar 2026US 12,590,892 B2Endress+Hauser Conducta GmbH+Co. KG
- Sensor module24 Mar 2026US 12,584,773 B2TE Connectivity Solutions GmbH
- Methods and systems for point-of-care coagulation assays by optical detection10 Mar 2026US 12,571,732 B2Instrumentation Laboratory Company
- Measuring cell for performing optical measurements25 Nov 2025US 12,480,863 B2Endress+Hauser Conducta GmbH+Co. KG
- Detection and monitoring of dosage delivery for vaporized waxes, solids or viscous oils, and cannabinoids30 Sep 2025US 12,427,271 B2Arizona Board of Regents on behalf of Arizona State University
- Detection and monitoring of scale formation in fluid mixtures30 Jul 2026US 2026/0219183 A1King Fahd University of Petroleum and Minerals
- Device for sensing water quality25 Jun 2026US 2026/0177481 A1LG Electronics Inc.
- Wastewater testing apparatus and cleaning device4 Jun 2026US 2026/0153431 A1Beijing Roborock Technology Co., Ltd.
- Water quality determination device, water quality determination method, and flow cell12 Mar 2026US 2026/0072005 A1Wota Corp.
- System and method for in-line optical sensing of hydrogen peroxide5 Mar 2026US 2026/0063550 A1CardioQuip, LLC
Most cited
By later US patents
- Method and equipment for measuring absorptance of light scattering materials using plural wavelengths of light107US 5,239,185 AHitachi, Ltd. · 1993
- Optical dust detector assembly for use in an automotive vehicle105US 4,748,336 ANippondenso Co., Ltd. · 1988
- Analysis of downhole OBM-contaminated formation fluid93US 6,274,865 B1Schlumberger Technology Corporation · 2001
- Apparatus for monitoring engine exhaust83US 7,696,501 B2Hartridge Limited · 2010
- Analysis of downhole OBM-contaminated formation fluid81US 6,350,986 B1Schlumberger Technology Corporation · 2002