Removable filter for a forced air duct grill
Patent 5690719 Issued on November 25, 1997. Estimated Expiration Date: 
October 19, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 19, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 545234 filed on 10/19/1995US Classes:96/17, Electric charge produced by friction (e.g., by gas flow, etc.)55/486, Plies or layers of different characteristics or orientation55/495, Unit or cohesive sheet-like media in flow line or frame55/504, Aligned stop, media and removable retainer55/524, With coating, impregnant, or bonding agent96/134, Plural diverse separating means454/246, Baseboard type454/283, With screen mounting means454/287Baseboard typeExaminersPrimary: Smith, Duane S.Attorney, Agent or FirmInternational ClassesB03C 003/30B01D 046/10 AbstractA filter apparatus for mounting over an opening at an end of a forced air system duct has a filter frame with sidewalls between open front and back ends and a channel which opens inwardly of the sidewalls. At the front end is a sheet of preferably self charging electrostatic washable filter material behind a grill, both of which are peripherally disposed within the channel and are sized and sufficiently flexible so as to be removably insertable into the channel. A second sheet of a second filter material, preferably including activated charcoal, may be disposed in the channel behind the first sheet of filter material. The filter material may be made of a woven polypropylene and the sheet may have heat sealed finished edges. A wall mount having a support frame for mounting on a wall around the opening which extends through the wall is sized and operable to support the filter frame. The support frame may be mounted to a wall. A securing lock may be used to lock the filter frame in place within the support frame and may have a pin slideably and tightly disposed through aligned apertures in the filter and support frames.Field of SearchWITH GAS FLOW EFFECTING MEANSHinged or pivoted retainer or clamp on backing frame or in flow line Unit or cohesive sheet-like media in flow line or frame Plies or layers of different characteristics or orientation With coating, impregnant, or bonding agent TWO OR MORE SEPARATORS (E.G., SPACED FILTERS IN FLOW LINE OR CASING) Edge supported or secured only FILTERING Electric charge produced by friction (e.g., by gas flow, etc.) Plural diverse separating means Air distributor with return vent (e.g., register, etc.) Baseboard type Floor type With screen mounting means Including specific air distributor (e.g., register, etc.) Baseboard type Floor type | |
