# US 4,391,773 A · Method of purifying air and negative field generator

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- Number: US 4,391,773 A
- Document ID: US4391773A
- Status: Granted
- Kind: A
- Application number: 06/271,132
- Filed: 1981-06-08
- Granted: 1983-07-05
- Earliest claimed: 1981-06-08
- Inventors: G. Patrick Flanagan
- Web page: https://patentgrep.com/patent/US4391773A

## CPC

- A61L 9/22: Ionisation
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)

## Abstract

A housing encloses a high voltage, high frequency power supply having output terminals connected to a pair of electrodes mounted on opposite sides of a solid dielectric, the electrodes and solid dielectric being encapsulated in an insulator and mounted in a tunnel in the housing, the air to be purified being circulated through the tunnel.

## Claims

### Claim 1

A method of purifying air, comprising the steps of
placing in proximity to said air a capacitor including a pair of electrodes spaced apart by a solid dielectric material, and
applying between said electrodes an A.C. voltage of at least about 5000 volts having a frequency of at least twenty kiloHertz, said voltage being less than the breakdown voltage across said electrodes.

### Claim 2 (depends on 1)

A method according to claim 1, comprising the further step of
circulating the air to be purified through a space within fifty centermeters of said capacitor.

### Claim 3 (depends on 1)

A method according to claim 1, wherein
said dielectric is a sheet of dielectric material, and
said electrodes are generally planar conductive members.

### Claim 4 (depends on 3)

A method according to claim 3, wherein said sheet of dielectric material is acrylic resin.

### Claim 5

Apparatus for generating a negative field in a gas, comprising
a solid, dielectric sheet,
first and second metallic electrodes respectively mounted in mutually parallel relationship to opposite sides of said dielectric sheet,
a body of insulating material completely enclosing said electrodes and said dielectric sheet to prevent any arcing between said electrodes, and
means for connecting a high voltage, high frequency source between said electrodes.

### Claim 6 (depends on 5)

Apparatus according to claim 5, wherein
said source has a voltage of 5000 volts or more and a frequency of twenty kiloHertz or more.

### Claim 7 (depends on 5)

Apparatus according to claim 5 comprising
passageway means defining a passageway,
said electrodes, said dielectric sheet and said body of insulating material being mounted within said passageway, and
blower means for causing said air to flow through said passageway.

### Claim 8 (depends on 7)

Apparatus according to claim 7 comprising
housing means in which said source is mounted and which includes said passageway means.