Patent ID: 9579595
Date: 2017-02-28
CPC Classifications: B01D

Claim:
1. A transmission oil filter comprising a filtration layer of fiberglass medium having at least 90 percent by weight of fiberglass, wherein said filtration layer has a fiber diameter of 1 micrometer to 8 micrometers, a layer thickness of 0.3 mm to 1.0 mm, and a fabric weight of 40 to 110 GSM, and downstream of said filtration layer, a melt blown layer is arranged directly onto a downstream face of said fiberglass filtration layer, wherein said melt blown layer is not a filtration layer, said melt blown layer having at least 90 percent by weight polyester fibers of a diameter of 1 micrometer to 30 micrometers, a layer thickness of 0.2 mm to 0.7 mm, and a fabric weight of 20 GSM to 60 GSM, wherein the melt blown layer has a lower median fabric weight, and a lower median layer thickness than the filtration fiberglass layer, whereby the meltblown layer does not have a filtration effect relative to the filtration fiberglass layer, said melt blown layer serves only for retaining fiberglass or fiberglass medium pieces from the filtration layer in the oil filter, preventing or reducing introduction of fiberglass into a liquid to be filtered.