US4818365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state indicator electrode and method of making same
Assignee: Monsanto Co
•
Filing: 1986-10-14
•
Granted: 1989-04-04
•
Expires: 2006-10-14
Abstract
Abstract A junction-type metal/metal oxide solid state indicator electrode wherein the sensing portion of the electrode is coated with a perfluorocarbon copolymer, and a pH sensor made of the indicator electrode and a reference electrode.
Inventors
- 👤 Patrick J. Kinlen
- 👤 John E. Heider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/40
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
31 words
A junction-type metal/metal oxide solid state indicator electrode having improved rejection of interferences caused by anion migration comprising a sensing portion, wherein the sensing portion has a cured perfluorocarbon copolymer coating.
Claim 2
Dependent Claim
31 words
A junction-type metal/metal oxide solid state indicator electrode having improved rejection of interferences caused by anion migration comprising a sensing portion, wherein the sensing portion has a cured perfluorocarbon copolymer coating.
Claim 3
Dependent Claim
26 words
The solid state indicator electrode of claim 1 wherein the metal/metal oxide is selected from the group consisting of palladium/palladium oxide, iridium/iridium oxide and titanium/iridium oxide.
Claim 4
Dependent Claim
62 words
The solid state indicator electrode of claim 1 wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO 2 F or COF group.
Claim 5
Dependent Claim
16 words
The solid state indicator electrode of claim 3 where the metal/metal oxide-junction-type electrode is titanium/iridium oxide.
Claim 6
Independent Claim
64 words
A method for making a junction-type metal/metal oxide solid state indicator electrode comprising the steps: (a) contacting the electrode with a perfluorocarbon copolymer to form a copolymer-coated electrode, (b) drying the coated electrode, (c) repeating (a) and (b) from 2 to 5 times, to form a sufficiently coated electrode, (d) curing the copolymer coating, (e) cooling the electrode, and (f) hydrating the copolymer coating.
Claim 7
Independent Claim
64 words
A method for making a junction-type metal/metal oxide solid state indicator electrode comprising the steps: (a) contacting the electrode with a perfluorocarbon copolymer to form a copolymer-coated electrode, (b) drying the coated electrode, (c) repeating (a) and (b) from 2 to 5 times, to form a sufficiently coated electrode, (d) curing the copolymer coating, (e) cooling the electrode, and (f) hydrating the copolymer coating.
Claim 8
Dependent Claim
23 words
The method of claim 5 wherein the metal/metal oxide is selected from the group consisting of palladium/palladium oxide, iridium/iridium oxide and titanium/iridium oxide.
Claim 9
Dependent Claim
57 words
The method of claim 5 wherein the perfluorocarbon copolymer is a copolymer of two or more monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluorethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO 2 F or COF group.
Claim 10
Dependent Claim
49 words
The method of claim 5 wherein the electrode is contacted with a perfluorocarbon copolymer by dip coating 2 to 5 times in about a 5% to 15% by weight solution of the perfluorocarbon copolymer and dried at about 80° C. to 120° C. for about 30 to 90 minutes.
Claim 11
Dependent Claim
47 words
The method of claim 8 wherein the copolymer coating of the junction-type electrode is cured by heating in the range of about 180° C. to 230° C. for about 15 to 60 minutes and cooled to room temperature over a period of about 30 to 90 minutes.
Claim 12
Dependent Claim
27 words
The method of claim 9 wherein the copolymer coating of the electrode is hydrated by boiling in a buffer solution for about 15 to about 45 minutes.
Claim 13
Dependent Claim
12 words
The solid state electrode made according to the method of claim 5.
Claim 14
Independent Claim
196 words
A method to make a junction-type metal/metal oxide solid state indicator electrode having improved rejection of interferences causes by anion migration comprising the steps: (a) dip coating the electrode in a solution or suspension containing about 5% to 15% by weight of a perfluorocarbon copolymer to form a copolymer-coated electrode, (b) drying the coated electrode at about 80° C. to 120° C. for about 30 to 90 minutes, (c) repeating (a) and (b) from 2 to 5 times to form a sufficiently coated electrode, (d) heating to cure the coated electrode in the range of about 180° to 230° C. for about 30 to 90 minutes, (e) cooling the electrode to room temperature over a period of about 30 to 90 minutes, and (f) hydrating the copolymer coating of the electrode by boiling in a buffer solution for about 15 to about 45 minutes, wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO 2 F or COF group.
Claim 15
Independent Claim
196 words
A method to make a junction-type metal/metal oxide solid state indicator electrode having improved rejection of interferences causes by anion migration comprising the steps: (a) dip coating the electrode in a solution or suspension containing about 5% to 15% by weight of a perfluorocarbon copolymer to form a copolymer-coated electrode, (b) drying the coated electrode at about 80° C. to 120° C. for about 30 to 90 minutes, (c) repeating (a) and (b) from 2 to 5 times to form a sufficiently coated electrode, (d) heating to cure the coated electrode in the range of about 180° to 230° C. for about 30 to 90 minutes, (e) cooling the electrode to room temperature over a period of about 30 to 90 minutes, and (f) hydrating the copolymer coating of the electrode by boiling in a buffer solution for about 15 to about 45 minutes, wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO 2 F or COF group.
Claim 16
Dependent Claim
39 words
A pH sensor having improved rejection of interferences comprising: (a) a junction-type metal/metal oxide solid state indicator electrode having a sensing portion, wherein the sensing portion has a cured perfluorocarbon copolymer coating, in combination with (b) a reference electrode.
Claim 17
Dependent Claim
39 words
A pH sensor having improved rejection of interferences comprising: (a) a junction-type metal/metal oxide solid state indicator electrode having a sensing portion, wherein the sensing portion has a cured perfluorocarbon copolymer coating, in combination with (b) a reference electrode.
Claim 18
Dependent Claim
23 words
The pH sensor of claim 13 wherein the reference electrode is selected from the group consisting of standard calomel electrodes and Ag/AgCl electrodes.
Claim 19
Dependent Claim
35 words
The pH sensor of claim 13 wherein the reference electrode is a metal/metal salt electrode comprising an immobilized electrolyte in contact with the metal/metal salt electrode wherein the immobilized electrolyte has a perfluorocarbon copolymer coating.
Claim 20
Dependent Claim
24 words
The pH sensor of claim 13 wherein the metal/metal oxide is selected from the group consisting of palladium/palladium oxide, iridium/iridium oxide and titanium/iridium oxide.
Claim 21
Dependent Claim
58 words
The pH sensor of claim 13 wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO 2 F or COF group.
Claim 22
Dependent Claim
127 words
A pH sensor having improved rejection of interferences and a sensing portion and a support of electrically non-conductor material comprising: (a) a junction-type metal/metal oxide solid state indicator electrode in contact with the support, in combination with (b) a Ag/AgCl reference electrode in contact with the support wherein the reference electrode has an immobilized chloride in contact with the Ag/AgCl, and (c) a coating of a cured perfluorocarbon copolymer over the sensing portion of the pH sensor, wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoroalkylvinyl ether), and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO 2 F group.
Claim 23
Dependent Claim
127 words
A pH sensor having improved rejection of interferences and a sensing portion and a support of electrically non-conductor material comprising: (a) a junction-type metal/metal oxide solid state indicator electrode in contact with the support, in combination with (b) a Ag/AgCl reference electrode in contact with the support wherein the reference electrode has an immobilized chloride in contact with the Ag/AgCl, and (c) a coating of a cured perfluorocarbon copolymer over the sensing portion of the pH sensor, wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoroalkylvinyl ether), and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO 2 F group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |