# US 5,707,411 A · Frameless monolayer air register filter

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,707,411 A
- Document ID: US5707411A
- Status: Granted
- Kind: A
- Application number: 08/783,823
- Filed: 1997-01-13
- Granted: 1998-01-13
- Earliest claimed: 1994-12-02
- Inventors: Doreen Rodaway; Dixie Schwartz
- Web page: https://patentgrep.com/patent/US5707411A

## CPC

- D04H 1/46: by needling or like operations to cause entanglement of fibres (D04H1/45 takes precedence; needling machines D04H18/00)
- B01D 39/1623: {of synthetic origin}
- B01D 46/12: in multiple arrangements
- Y10S 55/35: Respirators and register filters
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A nonwoven needlepunched polyester batt of single monolayer construction is cut to a dimension slightly larger or smaller than the dimension of an interior warm air register, and fitted into the plenum of the heating system by compression or by stretching, as the case may be. The batt is integral, having no pockets or chambers therein. The filter has no frame, as the nonwoven batt has sufficient rigidity in relation to its weight to remain in place in the plenum, and is kept against the air register by the flow of air through the duct system, thereby filtering air flow.

## Claims

### Claim 1

An air filter comprising:
a unitary, single monolayer construction, nonwoven fibrous batt of predetermined thickness, said batt being cut to a predetermined length and width, said batt being compactable when compressed and being expandable when stretched, such that said batt is compressible widthwise and lengthwise into a heating, ventilation or air conditioning system duct plenum that is smaller in size than said batt, and such that said batt is expandable widthwise and lengthwise into a heating, ventilation or air conditioning system duct plenum that is larger in size than said batt, said batt having no support frame members and said batt having no pockets in its single monolayer construction;
said batt being inserted into the plenum of said duct into a position that is adjacent to an air register of said duct and substantially coplanar with the plane of said register.

### Claim 2 (depends on 1)

The filter as claimed in claim 1, which can be re-used after washing said filter of accumulated airborne particulate dirt.