# US 2014/0150797 A1 · Air purifier having an electret module

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- Number: US 2014/0150797 A1
- Document ID: US20140150797A1
- Status: Published application
- Kind: A1
- Application number: 14/004,284
- Filed: 2012-03-09
- Published: 2014-06-05
- Earliest claimed: 2011-03-10
- Assignees: Adc Tech International Ltd.
- Inventors: William S.H. Cheung
- Web page: https://patentgrep.com/patent/US20140150797A1

## CPC

- A62B 23/025: {the filter having substantially the shape of a mask (surgical face masks A41D13/11)}
- A62B 18/084: {Means for fastening gas-masks to heads or helmets}
- B03C 3/28: Plant or installations without electricity supply, e.g. using electrets
- B03C 3/30: in which electrostatic charge is generated by passage of the gases, i.e. tribo-electricity
- B03C 3/32: Transportable units, e.g. for cleaning room air
- B03C 3/363: {located before the filter}
- B03C 3/383: {using radiation}
- A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00)
- B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B)

## Abstract

An air purifier having an electret module for capturing airborne particles, the electret module including an electret element disposed within a housing and an adhesive layer coupled to the housing to capture airborne particles, whereby the static field of the electret attracts the airborne particles, which subsequently adhere to the adhesive layer.

## Claims

### Claim 1

An air purifier having an electret module for capturing airborne particles, the electret module, comprising:
an electret element disposed within a housing; and
an adhesive layer coupled to the housing to capture airborne particles.

### Claim 2 (depends on 1)

The air purifier of claim 1, wherein the housing is polyvinylchloride.

### Claim 3 (depends on 1)

The air purifier of claim 1, wherein the adhesive layer is polyvinylchloride.

### Claim 4 (depends on 1)

The air purifier of claim 1, further comprising a filter coupled to the electret module.

### Claim 5 (depends on 4)

The air purifier of claim 4, further comprising a strap coupled to the filter.

### Claim 6 (depends on 1)

The air purifier of claim 1, further comprising headgear coupled to the electret module.

### Claim 7 (depends on 1)

The air purifier of claim 1, wherein the electret element is a fluoropolymer.

### Claim 8 (depends on 1)

The air purifier of claim 1, wherein the electret element is non-porous polytetrafluoroethylene.

### Claim 9

An apparatus for increasing a surface potential of an electret element, comprising:
a high voltage generator;
an AC to DC rectifier;
a smoothing filter; and
a battery, wherein the generator, the rectifier, the smoothing filter, and the battery are electrically coupled and configured to increase the surface potential of the electret element.