US4857167A
Expired / Lapsed
US
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Oxygen-stable substituted ferrocene reference electrode
Assignee: Monsanto Co
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Filing: 1987-06-05
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Granted: 1989-08-15
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Expires: 2007-06-05
Abstract
Abstract A solid state reference electrode stable in the presence of oxygen having an electrically conductive material in contact with substituted ferrocene/ferrocenium ions.
Inventors
- 👤 James K. Bashkin
- 👤 Patrick J. Kinlen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:22
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/301
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
55 words
A solid state reference electrode comprising an electronically conductive material in contact with substituted ferrocene/ferrocenium ion selected from the group consisting of octamethyl ferrocene, decamethyl ferrocene, octaphenyl ferrocene, octaethyl ferrocene, nonaethyl ferrocene, trimethyl pentaethyl ferrocene, pentaphenylpentaethyl ferrocene, heptapropyl ferrocene and polymers of octamethyl distyrylmethyl ferrocene, octamethyl vinyl ferrocene, octamethyldivinyl ferrocene, octaethylvinyl ferrocene and triethylpentamethylvinyl ferrocene.
Claim 2
Dependent Claim
55 words
A solid state reference electrode comprising an electronically conductive material in contact with substituted ferrocene/ferrocenium ion selected from the group consisting of octamethyl ferrocene, decamethyl ferrocene, octaphenyl ferrocene, octaethyl ferrocene, nonaethyl ferrocene, trimethyl pentaethyl ferrocene, pentaphenylpentaethyl ferrocene, heptapropyl ferrocene and polymers of octamethyl distyrylmethyl ferrocene, octamethyl vinyl ferrocene, octamethyldivinyl ferrocene, octaethylvinyl ferrocene and triethylpentamethylvinyl ferrocene.
Claim 3
Dependent Claim
20 words
The electrode of claim 1 wherein the conductive material is selected from the group consisting of silver, platinum and carbon.
Claim 4
Dependent Claim
13 words
The electrode of claim 1 wherein the conductive material is a carbon paste.
Claim 5
Dependent Claim
24 words
The electrode of claim 3 wherein the substituted ferrocene/ferrocenium ion is selected from the group consisting of octamethyl ferrocene, decamethyl ferrocene and octaphenyl ferrocene.
Claim 6
Dependent Claim
13 words
The electrode of claim 4 wherein the substituted ferrocene/ferrocenium ion is decamethyl ferrocene.
Claim 7
Dependent Claim
16 words
A pH sensor comprising the reference electrode of claim 1 in combination with an indicator electrode.
Claim 8
Dependent Claim
14 words
The pH sensor of claim 6 wherein the indicator electrode is a glass electrode.
Claim 9
Independent Claim
58 words
A method for making a solid state reference electrode comprising contacting an electrically conductive material with substituted ferrocene/ferrocenium ions selected from the group consisting of octamethyl ferrocene, decamethyl ferrocene, octaphenyl ferrocene, octaethyl ferrocene, nonaethyl ferrocene, trimethyl pentaethyl ferrocene, pentaphenylpentaethyl ferrocene, heptapropyl ferrocene and polymers of octamethyl distyrylmethyl ferrocene, octamethyl vinyl ferrocene, octamethyldivinyl ferrocene, octaethylvinyl ferrocene and triethylpentamethylvinyl ferrocene.
Claim 10
Independent Claim
58 words
A method for making a solid state reference electrode comprising contacting an electrically conductive material with substituted ferrocene/ferrocenium ions selected from the group consisting of octamethyl ferrocene, decamethyl ferrocene, octaphenyl ferrocene, octaethyl ferrocene, nonaethyl ferrocene, trimethyl pentaethyl ferrocene, pentaphenylpentaethyl ferrocene, heptapropyl ferrocene and polymers of octamethyl distyrylmethyl ferrocene, octamethyl vinyl ferrocene, octamethyldivinyl ferrocene, octaethylvinyl ferrocene and triethylpentamethylvinyl ferrocene.
Claim 11
Dependent Claim
20 words
The method of claim 8 wherein the conductive material is selected from the group consisting of silver, platinum and carbon.
Claim 12
Dependent Claim
13 words
The method of claim 8 wherein the conductive metal is a carbon paste.
Claim 13
Dependent Claim
24 words
The method of claim 10 wherein the substituted ferrocene/ferrocenium ion is selected from the group consisting of octamethyl ferrocene, decamethyl ferrocene and octaphenyl ferrocene.
Claim 14
Dependent Claim
17 words
The method of claim 8 wherein the ratio of the ferrocene and ferrocenium ion is poised electrochemically.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |