US Patent No: 5,656,767

Number of patents in Portfolio can not be more than 2000

Automatic determination of moisture content and lubricant type

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Abstract

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A method and apparatus for automatically detecting a lubricant type and the relative quantity of water present in a test sample of lubricating oil includes the use of an open grid capacitive sensor element that incorporates the lubricating oil as a dielectric medium. The sensor element grid is energized by a frequency variable oscillator that automatically responds to changes in the oil dielectric constant with corresponding frequency changes. As a reference, a sample of new or uncontaminated test oil is confined in wet surface contact with the energized, open grid sensor element. Oscillator frequency changes are measured and recorded, either continuously or at frequent intervals, over a standardized elapsed time interval to generate a reference characterization of the frequency-time relationship distinctive of the particular oil. The same is repeated for a sample of contaminated oil and a corresponding frequency-time relationship generated. Water affinity rate correlations between frequency change and respective states of moisture content are determined and data base recorded. The affinity rate correlations are applied to the respective frequency differentials between the contaminated oil and uncontaminated oil at the end of the test period. Data bases are also recorded of correlations between natural frequency and sample temperature changes that distinguish lubricants by type, use classification or quantity of additive content.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
COMPUTATIONAL SYSTEMS, INC.KNOXVILLE, TN75

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Carey, Alexander Andrew Lenoir City, TN 4 45
Garvey, III Raymond E Loudon, TN 6 197

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
ROCKWELL AUTOMATION, INC. (1)
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GENERAL ELECTRIC COMPANY (1)
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Other [Check patent profile for assignment information] (1)
* 2010/0089,131 MEMS-based sensor for lubricant analysis 1 2009
 
ORION TECHNOLOGIES, CORP. (1)
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The Lubrizol Corporation (9)
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Intevep, S.A. (1)
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AGRICHEM, INC. (3)
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EMERSON CLIMATE TECHNOLOGIES, INC. (17)
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ABB TECHNOLOGY AG (2)
6,870,374 Process for identifying abnormalities in power transformers 5 2002
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Trico Corporation (9)
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D687923 Lubricant dispensing nozzle 1 2012
 
NOKIA CORPORATION (1)
* 2004/0236,706 Automated machinery lubrication service and maintenance planning system 3 2004
 
BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT (2)
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* Cited By Examiner