G01N 9/26
Investigating density or specific gravity of materials: by measuring pressure differences
Official title: by measuring pressure differences
G01N9/26 (Investigating density or specific gravity of materials: by measuring pressure differences) appears on 220 US grants and 185 published applications in this corpus.
Search patents in G01N- Granted patents
- 220
- Published applications
- 185
- Assignees
- 159
- Inventors
- 507
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 5 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 1 |
| 2003 | 5 | 2 |
| 2004 | 2 | 9 |
| 2005 | 5 | 8 |
| 2006 | 8 | 5 |
| 2007 | 6 | 2 |
| 2008 | 1 | 2 |
| 2009 | 3 | 6 |
| 2010 | 4 | 4 |
| 2011 | 1 | 2 |
| 2012 | 2 | 3 |
| 2013 | 2 | 5 |
| 2014 | 5 | 3 |
| 2015 | 2 | 8 |
| 2016 | 10 | 16 |
| 2017 | 9 | 11 |
| 2018 | 4 | 10 |
| 2019 | 7 | 8 |
| 2020 | 6 | 6 |
| 2021 | 5 | 20 |
| 2022 | 6 | 15 |
| 2023 | 14 | 14 |
| 2024 | 21 | 11 |
| 2025 | 11 | 8 |
| 2026 | 8 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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
- Improving accuracy by adding additional sensors to a density measuring system22 Sep 2026US 12,742,715 B2Honeywell International Inc.
- Alcohol and sugar content measuring device15 Sep 2026US 12,736,452 B2TrueDyne Sensors AG
- Electrode ink quality determination method, and measurement system30 Jun 2026US 12,669,420 B2Honda Motor Co., Ltd.
- Oxygen line verification for anesthesia gas flow controls23 Jun 2026US 12,661,475 B2Hu-Friedy Mfg.Co., Inc.
- Acid mixing system17 Sep 2026US 2026/0273148 A1Isopure, Corp.
- Well logging apparatus with buoyancy adjustment27 Aug 2026US 2026/0251058 A1Schlumberger Technology Corporation
- Systems and methods for varnish detection9 Apr 2026US 2026/0098849 A1Donaldson Company, Inc.
- Engine system and method for determining fuel characteristics22 Jan 2026US 2026/0022672 A1Caterpillar Inc.
- Abnormality determination device and abnormality determination method8 Jan 2026US 2026/0009690 A1Honda Motor Co., Ltd.
Most cited
By later US patents
- Distributed, unattended wastewater monitoring system69US 5,608,171 A1997
- Measuring flow in a pipe67US 4,856,344 ASchlumberger Technology Corporation · 1989
- Apparatus using a feedback network to measure fluid pressures59US 5,604,315 ASetra Systems, Inc. · 1997
- System and method for determining a density of a fluid51US 6,234,019 B1Smar Research Corporation · 2001
- Non-intrusive multiphase flow meter50US 6,945,095 B2Weatherford/Lamb, Inc. · 2005