EP0263693A2
Expired / Lapsed
EP
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Micro sensor
Assignee: 3M Co
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Filing: 1987-10-07
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Granted: —
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Expires: 2007-10-07
Abstract
Abstract A micro pH sensor is constructed by reacting powdered aminoalkylated cellulose with a dye to covalently bond the dye to the aminoalkyl groups on the cellulose. Any excess unreacted aminoalkyl groups are blocked with a blocking agent and the dye containing powdered cellulose is taken up in a solvent. A portion of the solvated dye containing cellulose is deposited in association with an optical fiber. The cellulose is regenerated into a solid matrix by acid treatment of the solvated dye containing cellulose to deposit the dye containing cellulose matrix on the optical fiber.
Inventors
- 👤 Masao Yafuso
- 👤 Henry Ka-Wah Hui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 17:59
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6428; G01N21/643; G01N2021/6434; G01N2021/6439; G01N21/75; G01N21/77; G01N21/78; G01N21/80
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
An event sensor which comprises: an optical fiber having an optical surface; a matrix of a regenerated polymeric material; a plurality of event sensing dye groups, said event sensing dye groups attached to said polymeric material; and said matrix of said regenerated polymeric material formed in situ on said optical surface of said optical fiber.
Claim 2
Dependent Claim
55 words
An event sensor which comprises: an optical fiber having an optical surface; a matrix of a regenerated polymeric material; a plurality of event sensing dye groups, said event sensing dye groups attached to said polymeric material; and said matrix of said regenerated polymeric material formed in situ on said optical surface of said optical fiber.
Claim 3
Dependent Claim
45 words
An event sensor of claim 1 wherein said polymeric material is cellulose and which further includes: a plurality of substituent groups located on said cellulose; and said plurality of event sensing dye groups attached to said cellulose are attached to one of said substituent groups.
Claim 4
Dependent Claim
24 words
An event sensor of claim 1 or 2 wherein: said dye is a pH sensitive dye; and said event sensor is a pH sensor.
Claim 5
Dependent Claim
40 words
An event sensor of claim 2 which further includes: a plurality of substituent group blocking groups, said plurality of substituent groups located on essentially any of said plurality of substituent groups which does not have a dye group attached thereto.
Claim 6
Dependent Claim
57 words
An event sensor of claim 2 or 4 wherein: said substituent groups are aminoethyl groups; said dye is a hydroxypyrenesulfonic acid dye or a salt thereof; each of said dye groups is attached to one of said aminoethyl groups with a sulfonylamido linkage; and said plurality of dye groups is less than said plurality of substituent groups.
Claim 7
Dependent Claim
42 words
An event sensor of claim 1, 2, 3, 4 or 5 which further includes: an overcoating, comprising cellulose containing an opaque agent in said cellulose, said overcoating covering said matrix of said regenerated polymeric material formed in situ on said optical fiber.
Claim 8
Dependent Claim
112 words
A process of forming a micro sensor which comprises: selecting a quantity of finely divided water insoluble ionic permeable hydrophilic polymer having a plurality of attachment sites thereon; reacting said attachment sites on said polymer with a quantity of an event sensitive dye so as to attach said dye to at least some of said attachment sites on said polymer to form a dye bearing polymer; 10 dissolving said dye bearing polymer in a solvent; depositing a quantity of said solvated dye bearing polymer onto an optical fiber; and regenerating said dye bearing polymer from said solvent to form a solid matrix on said optical fiber of said regenerated dye bearing polymer.
Claim 9
Dependent Claim
112 words
A process of forming a micro sensor which comprises: selecting a quantity of finely divided water insoluble ionic permeable hydrophilic polymer having a plurality of attachment sites thereon; reacting said attachment sites on said polymer with a quantity of an event sensitive dye so as to attach said dye to at least some of said attachment sites on said polymer to form a dye bearing polymer; 10 dissolving said dye bearing polymer in a solvent; depositing a quantity of said solvated dye bearing polymer onto an optical fiber; and regenerating said dye bearing polymer from said solvent to form a solid matrix on said optical fiber of said regenerated dye bearing polymer.
Claim 10
Dependent Claim
46 words
The process of claim 7 further including: selecting powdered cellulose as said polymer; said attachment sites on said cellulose comprising substituent groups on said cellulose; and attaching said dye to at least some of said substituent groups on said cellulose to form a dye substituted cellulose.
Claim 11
Dependent Claim
46 words
The process of claim 8 wherein said substituent groups are aminoalkyl groups and which further includes: reacting essentially any remaining aminoalkyl groups on said cellulose not having said dye attached thereto with a blocking group so as to render said blocked aminoalkyl groups essentially pH sensitive.
Claim 12
Dependent Claim
31 words
The process of claim 7, 8 or 9 further including: coating said solid matrix and a portion of said optical fiber surrounding said solid matrix with an overcoating of coating material.
References Cited (Backward Citations)
No citation records indexed.
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