US4115209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of determining ion activity using coated ion selective electrodes
Assignee: Research Corp
•
Filing: 1977-10-20
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Granted: 1978-09-19
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Expires: 1997-10-20
Abstract
Abstract The potentiometric responses caused by ion activity changes in solution are measured with an electrode formed by coating an ion exchange material which is molecularly dispersed throughout an insoluble film-forming polymeric matrix directly onto a conductive substrate such that an oxidation-reduction mechanism is not operative in the response of said electrode to the activity of ions in said solution.
Inventors
- 👤 Henry Freiser
- 👤 Helen J. James
- 👤 Gary Carmack
- 👤 Robert W. Cattrall
- 👤 Barbara M. Kneebone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:21
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
In a process for measuring the potentiometric responses caused by ion activity changes in solution, the improvement which comprises: using an electrode formed by coating an ion exchange material which is molecularly dispersed throughout an insoluble film-forming polymeric matrix directly onto a conductive substrate such that an oxidation-reduction mechanism is not operative in the response of said electrode to the activity of ions in said solutions.
Claim 2
Dependent Claim
66 words
In a process for measuring the potentiometric responses caused by ion activity changes in solution, the improvement which comprises: using an electrode formed by coating an ion exchange material which is molecularly dispersed throughout an insoluble film-forming polymeric matrix directly onto a conductive substrate such that an oxidation-reduction mechanism is not operative in the response of said electrode to the activity of ions in said solutions.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein said ion exchange material in said polymeric matrix is an ion exchange resin.
Claim 4
Dependent Claim
13 words
The process of claim 2, wherein said ion exchange resin is sulfonated polystyrene.
Claim 5
Dependent Claim
22 words
The process of claim 2, wherein said ion exchange resin is characterized by 2-6 meq. of exchangeable sites per gram of resin.
Claim 6
Dependent Claim
17 words
The process of claim 1, wherein said conductive substrate is in the form of a conductive wire.
Claim 7
Dependent Claim
32 words
The process of claim 1, wherein said dispersion of ion exchange material in said polymeric matrix is a colloidal dispersion or a true solution of ion exchange material in a polymeric matrix.
Claim 8
Dependent Claim
29 words
The process of claim 6, wherein said ion exchange material is dispersed in said polymeric matrix in an amount of from 1-25% by weight based on the total weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |