G01N 33/2876
Total acid number
Official title: {Total acid number}
G01N33/2876 (Total acid number) appears on 70 US grants and 69 published applications in this corpus.
Search patents in G01N- Granted patents
- 70
- Published applications
- 69
- Assignees
- 57
- Inventors
- 247
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 0 | 1 |
| 2003 | 3 | 1 |
| 2004 | 0 | 2 |
| 2005 | 2 | 2 |
| 2006 | 0 | 0 |
| 2007 | 3 | 7 |
| 2008 | 1 | 3 |
| 2009 | 2 | 6 |
| 2010 | 3 | 4 |
| 2011 | 2 | 4 |
| 2012 | 4 | 4 |
| 2013 | 1 | 4 |
| 2014 | 4 | 1 |
| 2015 | 4 | 1 |
| 2016 | 3 | 2 |
| 2017 | 1 | 0 |
| 2018 | 2 | 8 |
| 2019 | 1 | 7 |
| 2020 | 8 | 3 |
| 2021 | 4 | 2 |
| 2022 | 3 | 2 |
| 2023 | 2 | 1 |
| 2024 | 1 | 3 |
| 2025 | 1 | 0 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods and devices for monitoring machine fluids14 Jul 2026US 12,681,003 B2LogiLube, LLC
- Quantitating corrosive naphthenic acids in crude oil10 Feb 2026US 12,546,760 B2Phillips 66 Company
- Fluid property sensing array utilizing a neural network11 Mar 2025US 12,247,940 B2The University of Akron
- Engine lubrication oil consumption and condition monitoring21 May 2024US 11,988,117 B2Caterpillar Energy Solutions GmbH
- Methods and devices for monitoring machine fluids19 Sep 2023US 11,761,946 B2LogiLube, LLC
- Method for determining the acidity distribution curve of oils from the molecular composition of the crude oil23 May 2024US 2024/0170106 A1Petroleo Brasileiro S.A. - Petrobras
- Method for evaluating the thermal evolution of crude oils from different origins by ultra-high resolution mass spectrometry18 Apr 2024US 2024/0125720 A1Petroleo Brasileiro S.A. - Petrobras
- Quantitating corrosive naphthenic acids in crude oil1 Feb 2024US 2024/0036025 A1Phillips 66 Company
- Methods and devices for monitoring machine fluids14 Dec 2023US 2023/0400448 A1LogiLube, LLC
- Fluid property sensing array utilizing a neural network6 Oct 2022US 2022/0317081 A1The University of Akron
Most cited
By later US patents
- Intelligent fluid sensor for machinery diagnostics, prognostics, and control294US 7,581,434 B1Rockwell Automation Technologies, Inc. · 2009
- Method of estimating engine lubricant condition65US 6,920,779 B2International Truck Intellectual Property Company, LLC · 2005
- Sample plate for fluid analysis in a refinery process39US 8,591,814 B2BP Oil International Limited · 2013
- Method and device for measuring the acidity or basicity of insulating fluids, particularly mineral and synthetic oils31US 6,577,140 B12003
- Acid sensor29US 4,791,374 AThe Lubrizol Corporation · 1988