Abstract: This invention relates to methods for determining whether or not to discard a sample of oil based on the presence of polar compounds in the oil and devices to be used therewith. In a preferred embodiment a test strip comprising an adsorbent affixed to a backing is spotted with a polar indicator. A sample of oil is positioned on a heat conducting device supporting the test strip and the oil is allowed to migrate over the adsorbent material thereby displacing the polar indicator in an amount related to the amount of polar compounds in the oil. This displacement is correlated to the amount of polar compounds in the sample.
Type:
Grant
Filed:
June 24, 2002
Date of Patent:
November 7, 2006
Assignee:
3M Innovative Properties Company
Inventors:
Fidelis C. Onwumere, Robert A. Pranis, Jack G. Truong
Abstract: This invention relates to methods for determining whether or not to discard a sample of oil based on the presence of polar compounds in the oil and devices to be used therewith. In a preferred embodiment a test strip including an adsorbent affixed to a backing is spotted with a polar indicator. A sample of oil is positioned on a heat conducting device supporting the test strip and the oil is allowed to migrate over the adsorbent material thereby displacing the polar indicator in an amount related to the amount of polar compounds in the oil. This displacement is correlated to the amount of polar compounds in the sample.
Type:
Grant
Filed:
October 27, 2006
Date of Patent:
June 24, 2008
Assignee:
3M Innovative Properties Company
Inventors:
Fidelis C. Onwumere, Robert A. Pranis, Jack G. Truong
Abstract: The invention relates to methods for determining whether or not to discard a sample of oil based on the presence of polar compounds in oil and devices to be used to determine the presence of polar compounds in oil. In a preferred embodiment, a test strip comprising an adsorbent affixed to a backing is spotted with a polar indicator. A sample of oil is positioned on a heat conducting device supporting the test strip and the oil is allowed to migrate over the adsorbent material, thereby displacing the polar indicator in an amount related to the amount of polar compounds in the oil. This displacement is correlated to the amount of polar compounds in the sample.
Type:
Grant
Filed:
December 20, 1999
Date of Patent:
August 20, 2002
Assignee:
3M Innovative Properties Company
Inventors:
Fidelis C. Onwumere, Robert A. Pranis, Jack G. Truong