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Primary Examiner: Nozick, Bernard
Assistant Examiner:
Attorney: Alexander; Cruzan, Sell; Donald M., Tamte; Roger R.

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Title: Filter medium layered between supporting layers

Abstract: A new filter medium, which can remove a high percentage of fine particles from a gas stream while causing a relatively low pressure drop in the gas stream, comprises a base porous web, one or more lightweight non-self-supporting layers of microfibers collected and carried on the base porous web, and a top porous web. A new aerosol filter apparatus incorporates the new filter medium to provide economical consistent filtering of air in a home, office, or industrial environment. In this new filter apparatus, a web of the filter medium extends from a supply roll across a stream of the air being cleaned to a take-up roll; and the filter medium is advanced from the supply roll to the take-up roll to gradually provide a fresh length of filter medium in the air stream.

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Inventors: Carey, Jr., Patrick H. (Bloomington, MN, US)

Application Number: 612460
Filing Date: 1975-09-11
Publication_date: 1977-03-08
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Class(es): 55/354 55/487, 55/528, 55/DIG35, 128/205.29
Other Classes:
US Patent Ref:

2835341	May, 1958	Parke, Jr.	55/487.
3102014	Aug, 1963	Aitkenhead	55/352.
3251475	May, 1966	Till et al.	55/527.
3258900	Jul, 1966	Harms	55/487.
3316904	May, 1967	Wall et al.	55/528.
3460680	Aug, 1969	Domnick	55/485.
3606740	Sep, 1971	Ballennie	55/527.
3745748	Jul, 1973	Goldfield	55/354.

Other Refs: Other References: Superfine Thermoplastic Fibers by Van Wente in Industrial & Engineering Chemistry, vol. 48, No. 8, dated Aug. 1956, pp. 1342-1346.