Patent EP0442314A2 successfully refreshed from Google Patents.
EP0442314A2
Expired / Lapsed
EP
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An apparatus for detecting deterioration of the lubricating oil
Assignee: Denso Corp
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Filing: 1991-01-28
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Granted: —
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Expires: 2011-01-28
Abstract
Abstract A membrane of a polyaniline which is treated with an electrical oxidation and an electrical reduction is used by immersing in a lubricating oil. An electrical resistance of the membrane is varied in accordance with the amount of acid which is produced by the deterioration of lubricating oil. A pair of metallic electrodes detects the change of the electric resistance of the membrane.
Inventors
- 👤 Yutaka Maeda
- 👤 Hiroshi Ueshima
- 👤 Masaei Nozawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 18:50
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/2888; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
An apparatus for detecting deterioration of a lubricating oil electrically, characterized in that said apparatus further comprises; a membrane of a conducting polymer treated with an electrical oxidation and an electrical reduction, wherein an electrical resistance of said membrane is changed according to acid which is produced by the deterioration of said lubricating oil, and an electrical resistance detecting means for detecting a change of said electrical resistance of said membrane.
Claim 2
Dependent Claim
19 words
An apparatus for detecting deterioration of a lubricating oil according to claim 1; wherein said membrane comprises a polyaniline.
Claim 3
Dependent Claim
21 words
An apparatus for detecting deterioration of a lubricating oil according to claim 1 or 2, wherein said membrane includes a polyanion.
Claim 4
Independent Claim
22 words
An apparatus for detecting deterioration of a lubricating oil according to claims 1 to 3, wherein said membrane includes a nitrogen atom.
Claim 5
Independent Claim
26 words
An apparatus for detecting deterioration of a lubricating oil according to preceding claims; wherein said electrical resistance detecting means comprises a pair of comb shaped electrodes.
Claim 6
Independent Claim
33 words
An apparatus for detecting deterioration of a lubricating oil according to preceding claims, further comprising; a temperature compensating means for compensating a change of said electrical resistance caused by a change of temperature.
Claim 7
Independent Claim
23 words
An apparatus for detecting deterioration of a lubricating oil according to preceding claims, further comprising; a cooling means for cooling said lubricating oil.
References Cited (Backward Citations)
No citation records indexed.
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