Liquid purification or separation – Structural installation – Closed circulating system
Patent
1974-03-11
1977-12-06
Spear, Jr., Frank A.
Liquid purification or separation
Structural installation
Closed circulating system
210206, 23267B, B01D 1100
Patent
active
040615723
ABSTRACT:
An improved oil filter is provided which enables oil viscosity index improver and beneficial additives to be metered into the oil throughout its normal useful life. A conventional oil filter is modified by placing in the filter upstream from the filter element an oil-soluble, solid oil viscosity index improver such as a copolymer of ethylene and propylene with up to 10% by weight of 1,4-hexadiene, preferably in sheet form. Other additives can be dispersed in the improver. The improver is in association with means to limit contact of the copolymer with circulating oil. Preferably the contact limiting means is a perforated metal sheet.
REFERENCES:
patent: 1245626 (1917-11-01), Shaffer
patent: 3231324 (1966-01-01), Young
patent: 3336223 (1967-08-01), Kneeland
patent: 3343918 (1967-09-01), Moulder
patent: 3687849 (1972-08-01), Abbott
patent: 3772193 (1973-11-01), Nelli et al.
Cohen Lester Samuel
Lewis William Dein
E. I. Du Pont de Nemours and Company
Lander Ferris H.
Rudman Gilbert W.
Spear, Jr. Frank A.
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