Patent ID: 7670845
Filing Date: 2010-03-02
Classification: A01K,Y10T

Abstract:
1. A method of using an indicator granular material in a cat lavatory comprising the steps: placing at least one first granular material into a cat lavatory, the first granular material being substantially completely coated with a first opaque polymer layer that conceals the color and/or the material of the first granular material, wherein the first opaque polymer layer is solid at a first pH and is dissolved at a second pH, thereby disclosing the color and/or the material of the first granular material; placing a second granular material into a cat lavatory, the second granular material being substantially completely coated with a second opaque polymer layer that conceals the color and/or material of the second granular material, wherein the second opaque polymer layer is solid at a first pH and is dissolved at a third pH, thereby disclosing the color and/or the material of the second granular material; and placing a sample of a cat's urine into a cat lavatory, wherein the first and second granular material in the cat lavatory is used to determine the pH of the cat's urine by detecting whether or not the urine causes either the first or second opaque polymer layers to dissolve.