Patent US2413584A successfully refreshed from Google Patents.
US4236987A
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Electrode having membrane with ion selective properties
Assignee: Dr Eduard Fresenius Chemisch Pharmazeutische Industrie KG Apparatebau KG
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Filing: 1978-11-13
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Granted: 1980-12-02
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Expires: 1998-11-13
Abstract
Abstract There is provided a novel type of ion selective membrane comprising a non-ion selective carrier, and an ion selective active phase molecule having a hydrophilic segment and a lipophilic periphery. In the preferred embodiment said molecule is a siloxane molecule whose Si-O-Groups are open chain, branch chain or cyclically oriented. These ion selective membranes are useful in the selective detection of alkali- and alkaline-earth metals. There is further provided an electrode for use with such a membrane.
Inventors
- 👤 Johannes G. Schindler
- 👤 Wilfried Schael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:44
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/38; B01D69/00; B01D69/14; B01D69/141; B01D69/142; G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
An ion selective electrode, being selective with respect to predetermined alkali or alkaline-earth metal ions comprising: (a) a membrane comprising (i) a carrier membrane composed of a non-ion selective carrier material and (ii) an ion selective material in intimate contact with said carrier, said ion selective material comprising at least one predetermined molecular species exhibiting ion selectivity with respect to predetermined alkali or alkaline-earth metal ions said molecular species being selected from the group consisting of open chain, branch chain or cyclic siloxanes comprising a plurality of Si-O-Groups, the oxygen atoms of said siloxanes having hydrophilic properties and said siloxanes being substituted by lipophilic moieties, further including (b) electrical conducting means in intimate contact with said membrane.
Claim 2
Dependent Claim
117 words
An ion selective electrode, being selective with respect to predetermined alkali or alkaline-earth metal ions comprising: (a) a membrane comprising (i) a carrier membrane composed of a non-ion selective carrier material and (ii) an ion selective material in intimate contact with said carrier, said ion selective material comprising at least one predetermined molecular species exhibiting ion selectivity with respect to predetermined alkali or alkaline-earth metal ions said molecular species being selected from the group consisting of open chain, branch chain or cyclic siloxanes comprising a plurality of Si-O-Groups, the oxygen atoms of said siloxanes having hydrophilic properties and said siloxanes being substituted by lipophilic moieties, further including (b) electrical conducting means in intimate contact with said membrane.
Claim 3
Dependent Claim
92 words
An electrode in accordance with claim 1 wherein the lipophilic substitutents are selected from the group consisting of lower alkyl of 1 to 5 carbon atoms, lower alkenyl of 2 to 5 carbon atoms, cycloalkyl of 4 to 7 carbon atoms, lower alkoxy or halo lower alkoxy of 1 to 5 carbon atoms, phenyl, lower alkyl phenyl of 1 to 5 carbon atoms in the lower alkyl moiety, lower alkylcarboxy of 1 to 5 carbon atoms in the alkyl moiety, lower alkylene dioxy of 2 to 5 carbon atoms, hydrogen and halogen.
Claim 4
Dependent Claim
27 words
An electrode in accordance with claim 2 wherein the siloxane moiety is substituted by one, two or three of the substituent moieties set forth in claim 2.
Claim 5
Dependent Claim
25 words
An electrode in accordance with claim 1 wherein the carrier is a polymeric material selected from the group consisting of polyvinyl chloride, and nitro cellulose.
Claim 6
Dependent Claim
29 words
An electrode in accordance with claim 1 wherein the carrier material is ceramic, sintered glass, felt, woven and non-woven fiber containing fabrics having the ion selective material absorbed thereon.
Claim 7
Dependent Claim
10 words
An electrode according to claim 1 further comprising a plasticizer.
Claim 8
Dependent Claim
28 words
An electrode according to claim 6 wherein the plasticizer is a polar organic material capable of dissolving the carrier and being substantially non-volatile at ambient temperature and pressure.
Claim 9
Dependent Claim
30 words
An electrode in accordance with claim 6 wherein the plasticizer is selected from the group consisting of Tris(2-ethylhexyl phosphate), dinonyl phthalate sebesate derivatives, diphenylether, and ortho nitro phenyl octyl either.
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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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |