Patent ID: 7011781

Claim:
A method for producing an article of sheet material with temperature regulation means, the method comprising the steps of: providing a die having a generally flat surface with a rib upstanding from the surface; the rib winding lengthwise and widthwise of the die surface with a plurality of generally 180° turns therein; ends of the rib being coincident with an edge of the die and being proximate to each other; providing a breathable urethane foam sufficiently flexible to serve as a footwear insole material; applying the die surface and rib to the sheet under pressure and sufficient temperature to cause the rib to form a groove in the sheet; fixing a tube in the groove, the tube comprising a heat-conducting polymer and having an inlet and an outlet, and the tube being wholly contained in the groove and extending from one end of the groove to another end of the groove; attaching a liquid reservoir to the article and to remote ends of the tube inlet and outlet; applying a thermoelectric cooler/heating unit to the reservoir; and providing liquid or water to the reservoir, whereby the liquid or water is furnished from the reservoir through the tube to provide a selected temperature to the sheet, and furnished back to the reservoir for a further cycle; and wherein the die is heated to about 400° F. and is applied under pressure of about 500 p.s.i.