G01N 21/4133
Refractometers
Official title: {Refractometers, e.g. differential}
G01N21/4133 (Refractometers) appears on 345 US grants and 371 published applications in this corpus.
Search patents in G01N- Granted patents
- 345
- Published applications
- 371
- Assignees
- 301
- Inventors
- 949
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 5 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 7 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 0 |
| 2002 | 6 | 4 |
| 2003 | 3 | 4 |
| 2004 | 7 | 5 |
| 2005 | 2 | 7 |
| 2006 | 3 | 4 |
| 2007 | 8 | 12 |
| 2008 | 5 | 6 |
| 2009 | 6 | 9 |
| 2010 | 7 | 13 |
| 2011 | 6 | 8 |
| 2012 | 11 | 3 |
| 2013 | 4 | 9 |
| 2014 | 10 | 14 |
| 2015 | 9 | 17 |
| 2016 | 11 | 23 |
| 2017 | 15 | 29 |
| 2018 | 27 | 30 |
| 2019 | 31 | 27 |
| 2020 | 31 | 22 |
| 2021 | 13 | 22 |
| 2022 | 12 | 25 |
| 2023 | 14 | 25 |
| 2024 | 11 | 22 |
| 2025 | 24 | 18 |
| 2026 | 15 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and system for monitoring liquid-liquid extraction6 Oct 2026US 12,754,120 B2Triad National Security, LLC
- Observation device and observation method29 Sep 2026US 12,748,047 B2Hamamatsu Photonics K.K.
- Method for accumulating microscopic objects, and method for detecting microscopic objects using same29 Sep 2026US 12,748,113 B2University Public Corporation Osaka
- Optical element and optical sensor15 Sep 2026US 12,736,469 B2FUJIFILM Corporation
- Optical process monitoring device15 Sep 2026US 12,736,470 B2Kxs Technologies Oy
- Determining a refractive index for infrared wavelength ranges17 Sep 2026US 2026/0276541 A1University of Central Florida Research Foundation, Inc.
- Observation device and observation method13 Aug 2026US 2026/0235510 A1Hamamatsu Photonics K.K.
- Optical sensor and sensing method16 Jul 2026US 2026/0202318 A1City University of Hong Kong
- Refractometric System for Conducting Urinalysis in a Toilet9 Jul 2026US 2026/0194461 A1Vivosens Inc
- Method2 Jul 2026US 2026/0185937 A1Hydac Filter Systems GmbH
Most cited
By later US patents
- Reagentless analysis of biological samples by applying mathematical algorithms to smoothed spectra233US 7,303,922 B2Abbott Laboratories · 2007
- Method and instrument for detection of change of thickness or refractive index for a thin film substrate183US 5,631,171 ABiostar, Inc. · 1997
- Reagentless analysis of biological samples119US 6,087,182 AAbbott Laboratories · 2000
- Brewster angle refractometer115US 5,572,314 A1996
- Devices and methods for detection of an analyte based upon light interference93US 5,494,829 ABiostar, Inc. · 1996