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| Number | Title | Issue Date |
| 8080142 | Impurity detection device and method There is provided a sample preparation device and method for preparing a sample of liquid for detection of impurities. First (40) and second (38) electrodes are provided, located for immersion in a liquid under test. A semipermeable membrane (42... | 12/20/2011 |
| 7637611 | Adjustable spectacle kit An adjustable spectacle kit article is positioned in the interior of a self-contained breathing mask having a full face plate permitting viewing outside. The kit includes a bracket having an elongated slot for a lug attached to the mask interior. A portion of the lu... | 12/29/2009 |
| 7494218 | Adjustable spectacle kit Adjustable spectacles article and protection method include a novel adjustable spectacle kit positioned in the interior surface of a self contained breathing mask. In one aspect, the breathing mask covers a full face of a wearer and includes a face plate permitting ... | 02/24/2009 |
| 7323880 | Ground circuit impedance measurement Novel apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source adjusted to 25 amperes or less simulate a ground fault. Ground impedance is determined by dividing voltage drop by amperage to determine impedance ... | 01/29/2008 |
| 7242001 | Device for measuring water quality The present invention relates to a device for measuring both the color and turbidity of a liquid sample. LEDs are used as light sources and reference detectors are included to control the output of the LEDs. The device is also capable of monitoring and correcting fo... | 07/10/2007 |
| 7201831 | Impurity detection device There is provided a sample preparation device and method for preparing a sample of liquid for detection of impurities. First (40) and second (38) electrodes are provided, located for immersion in a liquid under test. A semipermeable membrane (42... | 04/10/2007 |
