US3607702A
Expired / Lapsed
US
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Electrochemical apparatus
Assignee: Individual
•
Filing: 1968-02-05
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Granted: 1971-09-21
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Expires: 1988-02-05
Abstract
Abstract An electrolytic junction membrance for the measuring of ionic potential in electrolytes is formed of a glass body having a continuous interconnected system of pores of an average, and preferably substantially uniform, pore-diameter between about 125 A. and 1,700 A. and preferably not above 250 A., and wherein the ratio of pore-volume to glass-volume is between about 1:2 and 2: 1; and a method of producing such glass body by heating glass above its melting point so as to form two distinct phases therein, solidifying the glass while maintaining said distinct phases, and removing one of the two distinct phases by leaching.
Inventors
- 👤 Wolfgand Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:09
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
The apparatus of claim 1 wherein 95 percent of the pore volume is composed of pores deviating by less than + or - 20% from average pore size.
Claim 2
Dependent Claim
12 words
The apparatus of claim 1 wherein said membrane consists of borosilicate glass.
Claim 3
Dependent Claim
20 words
The apparatus of claim 3, wherein said borosilicate glass comprises 85%-100% silica, 0%-15% alkali metal oxide and 0%-15% boric oxide.
Claim 4
Dependent Claim
11 words
The apparatus of claim 4, wherein said alkali metal is sodium.
Claim 5
Dependent Claim
14 words
The apparatus of claim 1 wherein one of the electrodes is an ion-selective electrode.
Claim 6
Dependent Claim
14 words
The apparatus of claim 1 wherein one of the electrodes is a reference electrode.
Claim 7
Dependent Claim
14 words
The apparatus of claim 1, wherein said average pore diameter is below 250 A.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |