Patent US4256561A successfully refreshed from Google Patents.
US4256561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical measuring electrode
Assignee: E FRESENIUS CHEMISCH PHARMAZEUTISCHE INDUSTRIE KG APPARATEBAU KG
•
Filing: 1979-05-08
•
Granted: 1981-03-17
•
Expires: 1999-05-08
Abstract
Abstract An electrochemical measuring electrode has an ion-selective membrane and direct potential take off via an electron conductor. A diffusion barrier layer is provided between the membrane and the electron conductor for the purpose of reducing or eliminating the sensitivity to faults which can be caused by the presence of gases in a medium which is to be analyzed and into which the sensor is introduced. The diffusion barrier preferably comprises an ion-conducting solid-state body having a high diffusion resistance to oxygen.
Inventors
- 👤 Johannes G. Schindler
- 👤 Wilfried Schal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:33
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
An electrochemical measuring electrode comprising: (a) an electrically conductive contact; (b) an ion selectively active organic polymer membrane covering said contact; and (c) at least one solid ion conducting diffusion barrier comprising a solid body having a high diffusion resistance to oxygen selected from the group consisting of a vitreous material, a dental cement, and a fused layer of salt, disposed between said membrane and said contact.
Claim 2
Dependent Claim
67 words
An electrochemical measuring electrode comprising: (a) an electrically conductive contact; (b) an ion selectively active organic polymer membrane covering said contact; and (c) at least one solid ion conducting diffusion barrier comprising a solid body having a high diffusion resistance to oxygen selected from the group consisting of a vitreous material, a dental cement, and a fused layer of salt, disposed between said membrane and said contact.
Claim 3
Dependent Claim
15 words
A measuring electrode according to claim 1, wherein the diffusion barrier is a vitreous material.
Claim 4
Dependent Claim
18 words
A measuring electrode according to claim 1, wherein the diffusion barrier comprises a fused layer of a salt.
Claim 5
Dependent Claim
15 words
A measuring electrode according to claim 1, wherein the diffusion barrier comprises a dental cement.
Claim 6
Dependent Claim
16 words
A measuring electrode according to claim 4 wherein said dental cement consists substantially of zinc oxyphosphate.
Claim 7
Dependent Claim
23 words
A measuring electrode according to claim 1, wherein the ion-selectively active membrane is made from PVC and contains an electrically neutral ion carrier.
Claim 8
Dependent Claim
23 words
A measuring electrode according to claim 1, wherein the ion-selectively active membrane is made from PVC and contains an electrically charged ion ligand.
Claim 9
Dependent Claim
55 words
A measuring electrode accoding to claim 1, wherein the ion-selectively active membrane comprises at least one organic polymer and at least one ion-selectively active component embedded in molecular or corpuscular distribution in said polymer, said ion-selectively active components being selected from the group consisting of organic carrier molecules, selective and charged ligands, and ion exchangers.
Claim 10
Dependent Claim
46 words
A measuring electrode in accordance with claim 1 wherein the electrically conductive contact is a metallic contact and wherein the diffusion barrier is a fused salt layer of a salt having a cation derived from a metal different from the metal in the electrically conductive contact.
References Cited (Backward Citations)
US3607710A
Cited
US3926764A
Cited
US3787307A
Cited
DE2251287A1
Cited
US3718569A
Cited
US3856649A
Cited
US4111777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |