Patent ID: 7618661

Claim:
A process for preparation of a Rhus verniciflua extract, comprising: (a) extracting Rhus verniciflua with a soluble solvent, thereby obtaining an extract; (b) subjecting the extract to ultrafiltration to remove high-molecular weight substances, concentrating and drying the extract, thereby obtaining an extract powder; and (c) irradiating far-infrared the extract powder with a far-infrared treatment system comprised of a light source positioned at the uppermost part of the system; a light-absorbing/heat-emitting layer having a thickness of 0.5 to 1 cm, absorbing light from the light source and emitting heat, and being composed of charcoal powder having a 100-mesh size; a far-infrared radiating layer having a thickness of 0.5 to 1 mm, located underneath the light-absorbing/heat-emitting layer and composed of dried Rhus verniciflua ; and a Rhus vernicifua extract powder layer having a thickness of 2 to 10 mm, located at a predetermined distance spaced away from the far-infrared radiating layer and sealed by a transparent substrate under inert atmosphere.