Sublimation of solid organic compounds onto substrate surfaces in the presence of a fluid impregnant
US6767860B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2001 |
| Grant date | Jul 27, 2004 |
| Priority date | — |
| Expiry date | May 14, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An approach for beneficially incorporating both a solid organic impregnant and a fluid impregnant into filter media particles without the presence or addition of one unduly affecting the performance of the other. The present invention achieves impregnation by combining sublimation and non-bulk absorption techniques. These techniques may be carried out in sequential, simultaneous, overlapping, and/or alternating fashion, or the like. The invention is especially suitable when the filter media particles already contain or are to contain one or more other impregnants, whose function or presence might be adversely affected when conventional methods are used to add the solid organic and fluid materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.