# US 9,752,998 B1 · Detecting anomalies in glass articles using NMR imaging

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- Number: US 9,752,998 B1
- Document ID: US9752998B1
- Status: Granted
- Kind: B1
- Application number: 14/018,978
- Filed: 2013-09-05
- Granted: 2017-09-05
- Earliest claimed: 2013-09-05
- Assignees: Owens-Brockway Glass Container Inc.
- Applicants: Owens-Brockway Glass Container Inc.
- Inventors: Ramasamy Raju; Pramod K Sharma
- Web page: https://patentgrep.com/patent/US9752998B1

## CPC

- G01N 24/085: {Analysis of materials for the purpose of controlling industrial production systems}
- G01R 33/3808: {Magnet assemblies for single-sided MR wherein the magnet assembly is located on one side of a subject only; Magnet assemblies for inside-out MR, e.g. for MR in a borehole or in a blood vessel, or magnet assemblies for fringe-field MR}
- 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)
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A method of inspecting a glass article using nuclear magnetic resonance imaging (NMRI). An NMRI-active filler material may be applied to the interior surface, the exterior surface, or both of the container. The excess material then may be removed leaving the filler within one or more anomalies on the surface of the container. And an NMRI analysis may be performed producing images associated with the anomalies having filler material therein.

## Claims

### Claim 1

A method of inspecting a glass container, which includes the steps of:
(a) applying a contrast agent to a surface of the glass container by at least one of spraying the glass container with the contrast agent or dipping the glass container in the contrast agent, and then
(b) removing excess material applied in said step (a) leaving the contrast agent in surface anomalies of the glass container by at least one of wiping, air-drying, heating, or blowing the glass container, and then
(c) subjecting the glass container to nuclear magnetic resonance (NMR) analysis to form images of the surface anomalies retaining the contrast agent, and then
(d) washing the glass container to remove the contrast agent.

### Claim 2 (depends on 1)

The method set forth in claim 1 wherein said surface is an exterior surface or an interior surface of the container.

### Claim 3 (depends on 1)

The method set forth in claim 1 wherein said contrast agent is an NMRI-active filler material.

### Claim 4 (depends on 3)

The method set forth in claim 3 wherein said filler material is a deuterated isotopic filler material including at least one of the following materials: Dimethyl Sulfoxide-d6; Acetic Acid-d4; Aceton-d6; Acetonitrile-d3; Benzene-d6; Chloroform-d; Chlorobenzene-d5; Cyclohexane-d12; N,N Dimethylformamide-d7; or Methanol-d4.

### Claim 5 (depends on 3)

The method set forth in claim 3 wherein said filler material is an non-isotopic filler material including at least one of the following materials: Dimethyl Sulfoxide (DMSO); Acetic Acid; Aceton; Acetonitrile; Benzene; Chloroform; Chlorobenzene; Cyclohexane; N,N Dimethylformamide (DMF); or Methanol.

### Claim 6 (depends on 3)

The method set forth in claim 3 wherein said filler material is at least one of the materials listed in Table I.

### Claim 7 (depends on 1)

The method set forth in claim 1, further comprising the step of forming the glass container before step (a), and wherein step (c) is carried out before the glass container enters a cold end of a glass container manufacturing process.