Patent US3787309A successfully refreshed from Google Patents.
US3787309A
Expired / Lapsed
US
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Specific ion electrode and method of making said electrode
Assignee: Rosemount Inc
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Filing: 1972-05-30
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Granted: 1974-01-22
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Expires: 1992-05-30
Abstract
Abstract A diffusion membrane material for a specific ion electrode which comprises a polymeric resin and a substantially water insoluble salt of the ion to be detected in admixture therewith. A method of making a diffusion membrane material for a specific ion electrode is also disclosed. The method comprises the steps of mixing a polymeric resin with a substantially insoluble salt of the ion to be detected. The resultant mixture is molded and sintered to provide a bar stock and the bar stock is formed into a diffusion membrane material.
Inventors
- 👤 R Neti
- 👤 K Sawa
- 👤 C Bing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:54
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
22 words
The method of claim 1 wherein the salt comprises from about 20 percent to about 75 percent by weight of the mixture.
Claim 2
Dependent Claim
17 words
The method of claim 2 wherein the salt comprises about 30 percent by weight of the mixture.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the salt is added in an amount insufficient to impair the structural strength of the resulting bar stock.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein the polyfluoroalkene is polytetrafluorethylene.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein the salt is in the form of particles of a size from about 10 to about 1,000 microns.
Claim 6
Dependent Claim
27 words
The method of claim 1 wherein, after mixing, the salt has a particle size from about 1 X 10 4 to about 50 X 10 4 centimeters.
Claim 7
Dependent Claim
20 words
The method of claim 7 wherein the molding pressure is from about 6,000 to about 20,000 lbs. per square inch.
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein the bar stock is formed into a diffusion membrane from about 0.030 to about 0.25 inches thick.
Claim 9
Dependent Claim
102 words
A specific ion electrode comprising: a. a tube adapted to contain, as an internal filling solution, a solution of the ion measured; b. an internal reference electrode positioned in the tube; c. a diffusion membrane at least across one end of the tube so as to function as a barrier between a sample to be measured and the internal filling solution, which comprises a polyfluoroalkene resin and a substantially water insoluble salt of the ion to be detected selected from the group consisting of aluminum phosphate, lanthanum fluoride, barium sulfate, silver chloride, silver bromide, silver iodide, and cadmium phosphate, in admixture therewith.
Claim 10
Dependent Claim
28 words
The specific ion electrode of claim 10 wherein, in the diffusion membrane, the salt comprises from about 20 percent to about 75 percent by weight of the mixture.
Claim 11
Dependent Claim
23 words
The specific ion electrode of claim 11 wherein, in the diffusion membrane, the salt comprises about 30 percent by weight of the mixture.
Claim 12
Dependent Claim
20 words
The specific ion electrode of claim 10 wherein, in the diffusion membrane, the mixture has been molded and sintered together.
Claim 13
Dependent Claim
28 words
The specific ion electrode of claim 13 wherein, in the Diffusion membrane, the salt is present in an amount insufficient to impair the structural strength of the structure.
Claim 14
Dependent Claim
25 words
The specific ion electrode of claim 10 wherein, in the diffusion membrane, the salt is barium sulfate and the ion to be detected is sulfate.
Claim 15
Dependent Claim
25 words
The specific ion electrode of claim 10 wherein, in the diffusion membrane, the salt is silver chloride and the ion to be detected is chloride.
Claim 16
Dependent Claim
25 words
The specific ion electrode of claim 10 wherein, in the diffusion membrane, the salt is aluminum phosphate and the ion to be detected is phosphate.
Claim 17
Dependent Claim
17 words
The specific ion electrode of claim 10 wherein, in the diffusion membrane, the polyfluoroalkene resin is polytetrafluoroethylene.
Claim 18
Dependent Claim
36 words
The specific ion electrode of claim 10, wherein in the diffusion membrane, the salt is in the form of particles of a size from about 1 X 10 4 to about 50 X 10 4 centimeters.
Claim 19
Dependent Claim
22 words
The specific ion electrode of claim 10 wherein the diffusion membrane has a thickness of from about 0.030 to about 0.25 inches.
References Cited (Backward Citations)
FR1402343A
Cited
FR1505744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |