Liquid filter having improved extended polypropylene element
US4104170A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1977 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Jan 7, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/69
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved filter of the cartridge type having concentric inner and outer filter elements is disclosed. The elements are formed of non-woven polypropylene fibers. In a preferred embodiment the outer element is formed of a laminate including a supporting layer of a continuous filament and a filtering layer of randomly oriented polypropylene fibers. The outer element is pleated and the space between the elements is filled with particulate, activated charcoal. The axial ends of the filter components are encapsulated in plastisol end caps to secure them together, and to form a sealable working surface to be engaged by the filter housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.