Patent ID: 7291264
Filing Date: 2007-11-06
Classification: B01D,C10M,C10N,F01M,Y10S

Abstract:
1. An oil filter, comprising: a hollow housing having an inlet and an outlet and defining a chamber therein with a flow path between the inlet and outlet; a mechanically active filter member disposed inside the housing in the flow path; and a chemically active filter member disposed inside the housing in the flow path; wherein the chemically active filter member comprises a plurality of particles having interstitial spaces therebetween, said particles having an average diameter of from 0.1 to 6 millimeters and being retained in said oil filter, the particles comprising a beneficial additive to be released into engine oil as said engine oil circulates through the interstitial spaces and wherein the particles further comprise a polymeric binder selected from the group consisting of polyamides, polyimides, polyesters, polyolefins, polysulfones, and mixtures thereof, and the particles are a product of a process comprising the steps of: providing the polymeric binder in a finely divided form; mixing the polymeric binder with the additive in a liquid solvent; forming the mixture of the binder and additive into particles; and removing the solvent from the particles by evaporation.