# US 8,786,394 B2 · Oxidation resistant induction devices

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- Number: US 8,786,394 B2
- Document ID: US8786394B2
- Status: Granted
- Kind: B2
- Application number: 13/100,490
- Filed: 2011-05-04
- Published: 2011-11-10
- Granted: 2014-07-22
- Earliest claimed: 2010-05-05
- Assignees: PerkinElmer Health Sciences, Inc.
- Applicants: Peter J. Morrisroe
- Inventors: Peter J. Morrisroe
- Web page: https://patentgrep.com/patent/US8786394B2

## CPC

- H01J 49/105: {using high-frequency excitation, e.g. microwave excitation, Inductively Coupled Plasma [ICP]}
- G01N 21/3103: {Atomic absorption analysis}
- G01N 21/73: using plasma burners or torches
- H01F 5/00: Coils (superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00)
- H01F 27/2823: {Wires (H01F27/2866 takes precedence)}
- H01F 38/14: Inductive couplings
- H01J 37/321: {the radio frequency energy being inductively coupled to the plasma}
- H01J 37/3211: {Antennas, e.g. particular shapes of coils}
- H01J 49/025: {Detectors specially adapted to particle spectrometers (data acquisition H01J49/0036; detectors per se G01T, e.g. G01T1/28, G01T1/29)}
- H05H 1/30: using applied electromagnetic fields, e.g. high frequency or microwave energy (H05H1/28 takes precedence)
- H01F 27/23: Corrosion protection
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H05H: PLASMA TECHNIQUE (apparatus or processes specially adapted for producing X-rays H05G2/00); PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS

## Abstract

Certain embodiments described herein are directed to induction devices comprising an oxidation resistant material. In certain examples, the induction device comprises a coil of wire that is produced from the oxidation resistant material. In some examples, the oxidation resistant induction device can be used to sustain an inductively coupled plasma in a torch.

## Claims

### Claim 1

An induction device comprising a helical induction coil comprising a plurality of coil turns coupled to each other, in which the helical induction coil comprises an oxidant resistant material and is configured to receive a torch to sustain a plasma in the torch by providing radio frequency energy to the torch, and in which the oxidation resistant material is present in an effective amount to sustain the plasma in the torch for at least ten hours without substantial oxidation of the helical induction coil.

### Claim 2 (depends on 1)

The induction device of claim 1, in which the oxidation resistant material comprises a non-coated material.

### Claim 3 (depends on 2)

The induction device of claim 2, in which the non-coated material comprises an aluminum alloy.

### Claim 4 (depends on 2)

The induction device of claim 2, in which the oxidation resistant material is selected to provide an overall electrode potential that is negative when the oxidation resistant material is reacted with oxygen.

### Claim 5 (depends on 1)

The induction device of claim 1, in which the induction coil consists essentially of an aluminum alloy.

### Claim 6 (depends on 1)

The induction device of claim 1, in which the oxidation resistant material is electrically coupled to a radio frequency source.

### Claim 7 (depends on 1)

The induction device of claim 1, in which the induction coil comprises at least 97% by weight of the oxidation resistant material.

### Claim 8

An induction device comprising a helical induction coil comprising a plurality of coil turns coupled to each other, in which the helical induction coil comprises an oxidant resistant paramagnetic material and is configured to receive a torch to sustain a plasma in the torch by providing radio frequency energy to the torch, and in which the oxidation resistant paramagnetic material is present in an effective amount to sustain a plasma in the torch for at least ten hours without substantial oxidation of the helical induction coil.

### Claim 9 (depends on 8)

The induction device of claim 8, in which the oxidation resistant paramagnetic material comprises a non-coated material.

### Claim 10 (depends on 9)

The induction device of claim 9, in which the non-coated paramagnetic material comprises an aluminum alloy.

### Claim 11 (depends on 9)

The induction device of claim 9, in which the oxidation resistant paramagnetic material is selected to provide an overall electrode potential that is negative when the oxidation resistant paramagnetic material is reacted with oxygen.

### Claim 12 (depends on 8)

The induction device of claim 8, in which the induction coil consists essentially of an aluminum alloy.

### Claim 13 (depends on 8)

The induction device of claim 8, in which the induction coil consists essentially of platinum.

### Claim 14 (depends on 8)

The induction device of claim 8, in which the oxidation resistant paramagnetic material is electrically coupled to a radio frequency source.