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| Number | Title | Issue Date |
| 6156089 | Two-stage air filter with multiple-layer stage and post-filter stage A system for circulating air which includes particles, bacterial organisms, and odoriferous material includes a fan coupled to ducting of the air circulation system for causing movement of air in a stream through the ducting; a filter holder configured to... | 12/05/2000 |
| 5922096 | Forced air system air filter An HVAC filter having a pleated paper filter and a plastic pre-filter, the filter and pre-filter are mounted in a parallel relation in the frame. The plastic pre-filter includes a plastic mesh having a plurality of openings, and an irregular surface on th... | 07/13/1999 |
| 5858045 | Multiple layer air filter media A filter media for an air filter includes at least two layers of filter material with the materials being different. The layers are joined together by a stiffening grid fabricated from a metal or plastic. Glue such as hot-melt glue is disposed on both sid... | 01/12/1999 |
| 5704953 | Forced air system air filter An HVAC filter having a pleated paper filter and a plastic pre-filter, the filter and pre-filter are mounted in a parallel relation in the frame. The plastic pre-filter includes a plastic mesh having a plurality of openings, and an irregular surface on th... | 01/06/1998 |
| 5571300 | Frame and pad filter system A filter apparatus for a reusable one piece filter frame housing and a filter media for use in a forced air ventilating system. The one piece filter frame housing having integrally formed fasteners to releasably secure a replaceable filter media. The filt... | 11/05/1996 |
| 5188646 | Adjustable air filter An adjustable air filter for use in heating, ventilating, cooling, and forced air systems. The air filter includes a media for filtering air and adapted to be cut with scissors, and a frame embracing the peripheral edges of the media. The frame includes a... | 02/23/1993 |
| 5145500 | Trimmable range hood filter A trimmable range hood filter for covering both an inlet opening of a range hood and a light on the range hood adjacent the inlet opening. The filter includes a rectangular filter element, four non-telescoping frame members sequentially arranged to form a... | 09/08/1992 |
