Filter element, filter, and method for removing odors from indoor air
AssigneeGeneral Time Corporation
InventorStephen E. Frazier
Life of this patent
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Abstract
An air filter element for removing odors from indoor air having a dry of a mixture of silica gel, activated carbon, and a zeolite. This dry mixture may also be impregnated with a liquid for inhibiting the growth of microorganisms, the liquid being a fungicide/bacteriocide preservative and a polyhydric alcohol, or a grapefruit pulp/polyhydric alcohol reaction product. Also disclosed are novel air filters having these air filter elements and a material for removing particulate matter from indoor air.
Claims42
An air filter element for removing odors from indoor air consisting essentially of a single layer of a dry mixture of silica gel, activated carbon and a zeolite.
An air filter element for removing odors from indoor air consisting essentially of:
- a. a first layer of silica gel impregnated with a liquid for inhibiting the growth of microorganisms, said liquid comprising:
- (i) a fungicide/bacteriocide preservative composition in an amount from about 0.5 to 2% by weight of the liquid;
- (ii) at least one polyhydric alcohol, said polyhydric alcohol being present in an amount from about 83 to 99.5% by weight of the liquid;
- and
- (iii) at least one additional compound for modifying the vapor pressure of said polyhydric alcohol, said additional compound being present in an amount from about 0 to 15% by weight of the liquid, said liquid being present in an amount from about 5 to about 50% by weight of the combined weight of said silica gel and said liquid, and
- b. a dry second layer of zeolite, active carbon, silica gel or mixtures thereof.
An air filter element for removing odors from indoor air consisting essentially of:
- a. a first layer of silica gel impregnated with a liquid for inhibiting the growth of microorganisms, said liquid comprising the product obtained by contacting grapefruit pulp with a non-toxic polyhydric alcohol to form a reaction product, and separating said reaction product from said pulp residue, said liquid being present in an amount from about 5 to 50% by weight of the combined weight of said silica gel and said liquid;
- and
- b. a dry second layer of zeolite, active carbon, silica gel or mixtures thereof.
Dependencies are inferred from the claim text.