G01N 9/00
Investigating density or specific gravity of materials
Official title: Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
G01N9/00 (Investigating density or specific gravity of materials) appears on 2,135 US grants and 1,928 published applications in this corpus.
Search patents in G01N- Granted patents
- 2,135
- Published applications
- 1,928
- Assignees
- 1,058
- Inventors
- 4,180
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 22 | 0 |
| 1977 | 22 | 0 |
| 1978 | 21 | 0 |
| 1979 | 16 | 0 |
| 1980 | 22 | 0 |
| 1981 | 23 | 0 |
| 1982 | 18 | 0 |
| 1983 | 15 | 0 |
| 1984 | 17 | 0 |
| 1985 | 16 | 0 |
| 1986 | 20 | 0 |
| 1987 | 31 | 0 |
| 1988 | 18 | 0 |
| 1989 | 34 | 0 |
| 1990 | 26 | 0 |
| 1991 | 32 | 0 |
| 1992 | 23 | 0 |
| 1993 | 21 | 0 |
| 1994 | 24 | 0 |
| 1995 | 28 | 0 |
| 1996 | 26 | 0 |
| 1997 | 23 | 0 |
| 1998 | 25 | 0 |
| 1999 | 23 | 0 |
| 2000 | 21 | 0 |
| 2001 | 22 | 6 |
| 2002 | 33 | 31 |
| 2003 | 34 | 43 |
| 2004 | 35 | 49 |
| 2005 | 37 | 59 |
| 2006 | 42 | 62 |
| 2007 | 47 | 54 |
| 2008 | 44 | 59 |
| 2009 | 37 | 47 |
| 2010 | 46 | 55 |
| 2011 | 39 | 63 |
| 2012 | 45 | 46 |
| 2013 | 40 | 76 |
| 2014 | 63 | 82 |
| 2015 | 57 | 87 |
| 2016 | 82 | 112 |
| 2017 | 64 | 82 |
| 2018 | 82 | 110 |
| 2019 | 83 | 110 |
| 2020 | 99 | 94 |
| 2021 | 97 | 112 |
| 2022 | 85 | 127 |
| 2023 | 93 | 116 |
| 2024 | 120 | 102 |
| 2025 | 85 | 78 |
| 2026 | 57 | 66 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01N 9/002Investigating density or specific gravity of materials: using variation of the resonant713
- G01N 9/24Investigating density or specific gravity of materials: by observing the transmission of408
- G01N 9/36Analysing materials by measuring the density or specific gravity283
- G01N 9/26Investigating density or specific gravity of materials: by measuring pressure differences220
- G01N 9/02Investigating density or specific gravity of materials: by measuring weight of a178
- G01N 9/10Investigating density or specific gravity of materials: by observing bodies wholly or168
- G01N 9/32Investigating density or specific gravity of materials: by using flow properties of145
- G01N 9/08Investigating density or specific gravity of materials: by measuring buoyant force of34
All 9 subgroupsShow fewer
Recent patents
- Measurement of flow rate, density, viscosity, and rheology of multiphase fluids in a pipe6 Oct 2026US 12,754,115 B2Saudi Arabian Oil Company
- Construction material assessment method and systems6 Oct 2026US 12,754,146 B2
- Non-destructive measurement, dispense, and replication of density gradients29 Sep 2026US 12,748,026 B2Beckman Coulter, Inc.
- Specific gravity measurement device29 Sep 2026US 12,748,027 B2Alfa Mirage Co., Ltd.
- System for measuring of a concentration parameter of a flow of a solid/liquid mixture22 Sep 2026US 12,742,714 B2IHC Holland IE B.V.
- Vibronic measuring device8 Oct 2026US 2026/0309603 A1Endress + Hauser GmbH + Co. KG
- Vibronic measuring device8 Oct 2026US 2026/0309604 A1Endress + Hauser GmbH + Co. KG
- Vibronic measuring system for a fluid medium conveyed in a pipe8 Oct 2026US 2026/0309605 A1Endress + Hauser Flowtec AG
- Method for measuring downhole holdup, and method for determining downhole fluid interface and geometric distribution8 Oct 2026US 2026/0309606 A1China University of Petroleum (East China)
- Density sensor for quantifying production fluid content24 Sep 2026US 2026/0286835 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Micromachined fluidic apparatus219US 6,477,901 B1Integrated Sensing Systems, Inc. · 2002
- Mass spectrometers and methods for rapid screening of libraries of different materials218US 5,959,297 ASymyx Technologies, Inc. · 1999
- Biosensor for measuring changes in viscosity and/or density of a fluid176US 5,494,639 ABehringwerke Aktiengesellschaft · 1996
- Multiple-phase flowmeter and materials analysis apparatus and method146US 4,228,353 A1980
- Liquid trap or separator for electrosurgical applications134US 10,916,415 B2Micromass UK Limited · 2021