Patent ID: 8496739

Claim:
A filter apparatus comprising: a honeycomb shaped support body; an activated carbon layer on the support body; and an organic antioxidant; wherein the organic antioxidant is present as a solid phase, wherein the organic antioxidant is present as an organic antioxidant layer and the activated carbon layer is sandwiched between the organic antioxidant layer and the support body, and wherein the organic antioxidant is selected from ascorbic acid, glutathione, sodium ascorbate, calcium ascorbate, trans stilbene oxide, tetrakis-(methylene-(3,5-di-(tert)-butyl-4-hydrocinnamate))methane, octadecyl 3,5-Di-(tert)-butyl-4-hydroxyhydrocinnamatelimonene, citrus oils, tocopherol, or combinations thereof.