# US 5,704,118 A · Method of making a carbon sensor electrode

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- Number: US 5,704,118 A
- Document ID: US5704118A
- Status: Granted
- Kind: A
- Application number: 08/411,525
- Filed: 1995-03-28
- Granted: 1998-01-06
- Earliest claimed: 1992-09-09
- Assignees: Agency of Industrial Science and Technology
- Inventors: Hiroko Kaneko; Akira Negishi; Ken Nozaki
- Web page: https://patentgrep.com/patent/US5704118A

## CPC

- G01N 27/308: {at least partially made of carbon}
- C12Q 1/001: {Enzyme electrodes}
- Y10T 29/49204: Contact or terminal manufacturing
- 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)
- C12Q: MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS (immunoassay G01N33/53); COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A process for producing a carbon sensor for measuring a composition, includes (a) providing first and second carbon electrodes each comprised of a bundle of linear, thin carbon members; (b) surrounding the first carbon electrode by dipping the first carbon electrode in a solution comprised of a reactive substance which reacts chemically with the composition to be measured; (c) disposing the first carbon electrode and the solution in a cylindrical ion permeable membrane to hold the solution in the first carbon electrode as well as between the first carbon electrode and the cylindrical ion permeable membrane; (d) positioning the cylindrical ion permeable membrane including the first carbon electrode and the solution in an insulating tubular member; and (e) disposing the second carbon electrode between the insulating tubular member and the cylindrical ion permeable membrane. Alternatively, the solution may be poured into a cylindrical ion permeable membrane and the first carbon electrode may be inserted into the cylindrical ion permeable membrane to hold the solution between the first carbon electrode and the ion permeable membrane and thereby surround the bundle.

## Claims

### Claim 1

A process for producing a carbon sensor for measuring a composition, comprising:
a. providing first and second carbon electrodes each comprised of a bundle of linear, thin carbon members;
b. surrounding the first carbon electrode by dipping the first carbon electrode in a solution comprised of a reactive substance which reacts chemically with the composition to be measured;
c. disposing the first carbon electrode and the solution in a cylindrical ion permeable membrane to hold the solution in the first carbon electrode as well as between the first carbon electrode and the cylindrical ion permeable membrane;
d. positioning the cylindrical ion permeable membrane including the first carbon electrode and the solution in an insulating tubular member; and
e. disposing the second carbon electrode between the insulating tubular member and the cylindrical ion permeable membrane.

### Claim 2 (depends on 1)

The process for producing a carbon sensor electrode as claimed in claim 1 wherein the first carbon electrode consists of a bundle of many linear thin carbon members.

### Claim 3 (depends on 1)

The process for producing a carbon sensor electrode as claimed in claim 1, wherein the first carbon electrode is composed of said bundle of linear, thin carbon members which are selected from the group consisting of a twisted carbon yarn of carbon fibers, a thin carbon rod, a bundle-form carbon composed of twisted carbon yarns or thin carbon rods, and a carbon cloth of twisted carbon yarns, a bundle of linear, thin carbon members.

### Claim 4 (depends on 1)

The process for producing a carbon sensor electrode as claimed in claim 1, wherein the second carbon electrode is composed of said bundle of linear, thin carbon members which are selected from the group consisting of a twisted carbon yarn of carbon fibers, a thin carbon rod, a bundle-form carbon composed of twisted carbon yarns or thin carbon rods, and a carbon cloth of twisted carbon yarns.

### Claim 5 (depends on 1)

The process for producing a carbon sensor electrode as claimed in claim 1, wherein the insulating tubular member is composed of an insulating tube.

### Claim 6 (depends on 1)

The process for producing a carbon sensor electrode as claimed in claim 1, wherein the insulating tubular member is formed by wrapping an insulating sheet around the carbon electrode holding the solution containing the reactive substance.

### Claim 7

A process for producing a carbon sensor electrode for measuring a composition, comprising:
a. providing first and second carbon electrodes each comprised of a bundle of linear, thin carbon members;
b. pouring a solution comprised of a reactive substance which reacts chemically with the composition to be measured into a cylindrical ion permeable membrane;
c. inserting the first carbon electrode into the cylindrical ion permeable membrane to hold the solution between the first carbon electrode and the ion permeable membrane and thereby surround the bundle; and
d. disposing the cylindrical ion permeable membrane with the first carbon electrode and the solution into an insulating tubular member; and
e. disposing the second carbon electrode between the insulating tubular member and the cylindrical ion permeable membrane.

### Claim 8 (depends on 7)

The process for producing a carbon sensor electrode as claimed in claim 7, wherein the first carbon electrode consists of a bundle of many linear thin carbon members.