Filter and method of making same
US5124177A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1990 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Feb 10, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/90
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An odor-removing filter approaching the carbon- particle loading of a filled filter may be formed by spraying or roll coating the adhesive against one or more faces of a porous, fibrous, air-permeable mat, depositing carbon particles or other odor-removing particles of a size to compliment the void size of the mat on the adhesive coated face or faces of the mat and then driving the particles into the mat and thereafter curing the adhesive to lock the particles into the mat. The adhesive bond of the particles to the mat is improved by working the particles against the adhesive- coated fibers. An overspray of an adhesive may also be utilized to further improve the retention of the particles. So-called "clean filters" may be produced according to the method disclosed, wherein a white, fibrous mat has carbon particles loaded on one face while the opposite face appears white or "clean". An indicator filter notifying the user when the filter becomes grease laden may also be formed following the methods used herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.