US3897213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automated quantitative analysis of ionic species
Assignee: Dow Chemical Co
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Filing: 1973-08-06
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Granted: 1975-07-29
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Expires: 1993-08-06
Abstract
Abstract Integrated system for quantitative analysis, using ion exchange resins, of ionic species, typically at a remote location, includes an eluant water reservoir, a sample injection valve, a pump delivering water to the sample injection valve, ion exchange resin means for ion separation with or without treatment for interfering ions or for total conversion of all ions by ion exchange to a single preselected ion pair, a conductivity cell with associated readout means, and clean-up resin bed means, all connected in series and in a closed loop, the clean-up resin bed means delivering deionized water to the water reservoir, means for delivering sample solution and standard solution, at mutually exclusive times, to the sample injection valve, and a computercontroller coordinating sample delivery and readout. Preferably means is provided for occasionally flushing the sample solution delivery system with a bactericide. The readout means may include a teletype or other means for transmitting the analysis results to a remote location.
Inventors
- 👤 Timothy S Stevens
- 👤 William H Parth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:48
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/88; G01N30/96; G01N30/62; G01N2030/621; G01N2030/625; G01N30/64; G01N2030/645; G01N33/00; G01N33/18; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/200833; Y10T436/201666
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
178 words
INTEGRATED SYSTEM UTILIZING ION EXCHANGE RESIN MEANS IN AUTOMATED ANALYSIS OF A SAMPLE SOLUTION CONTAINING AT LEAST ONE IONIC SPECIES TO BE QUANTATIVELY DETERMINED, WHICH COMPRISES: A RESERVOIR FOR ELUANT WATER, VALVE MEANS FOR SELECTING A PREDETERMINED SIZED QUANTITY OF SAMPLE SOLUTION, HYDRAULIC PRESSURE MEANS FOR DELIVERY OF THE ELUANT WATER TO THE SAID VALVE MEANS, ION EXCHANGE RESIN BED MEANS RECEIVING ELUANT WATER AND SELECTED SAMPLE SOLUTION FROM THE VALVE MEANS, A CONDUCTIVITY CELL RECEIVING THE EFFLUENT FROM THE ION EXCHANGE RESIN BED MEANS, CLEAN UP RESIN BED MEANS RECEIVING THE EFFLUENT FROM THE CONDUCTIVITY CELL, LIQUID CONDUIT MEANS CONNECTING IN SERIES IN A CLOSED LOOP IN THE FOLLOWING SEQUENCE: THE RESERVOIR, THE HYDRAULIC PRESSURE MEANS, THE VALVE MEANS, THE ION EXCHANGE RESIN BED MEANS, THE CONDUCTIVITY CELL, AND THE CLEAN UP RESIN BED MEANS, READOUT MEANS ASSOCIATED WITH THE CONDUCTIVITY CELL, MEANS FOR DELIVERING TO THE SAID VALVE MEANS, AT MUTUALLY EXCLUSIVE TIMES, SAMPLE SOLUTION, AND STANDARD SOLUTION, AND A COMPUTER-CONTROLLER COORDINATING THE INTRODUCTIONS OF SAMPLE SOLUTION AND OF STANDARD SOLUTION WITH THE READ OUT MEANS.
Claim 2
Dependent Claim
178 words
INTEGRATED SYSTEM UTILIZING ION EXCHANGE RESIN MEANS IN AUTOMATED ANALYSIS OF A SAMPLE SOLUTION CONTAINING AT LEAST ONE IONIC SPECIES TO BE QUANTATIVELY DETERMINED, WHICH COMPRISES: A RESERVOIR FOR ELUANT WATER, VALVE MEANS FOR SELECTING A PREDETERMINED SIZED QUANTITY OF SAMPLE SOLUTION, HYDRAULIC PRESSURE MEANS FOR DELIVERY OF THE ELUANT WATER TO THE SAID VALVE MEANS, ION EXCHANGE RESIN BED MEANS RECEIVING ELUANT WATER AND SELECTED SAMPLE SOLUTION FROM THE VALVE MEANS, A CONDUCTIVITY CELL RECEIVING THE EFFLUENT FROM THE ION EXCHANGE RESIN BED MEANS, CLEAN UP RESIN BED MEANS RECEIVING THE EFFLUENT FROM THE CONDUCTIVITY CELL, LIQUID CONDUIT MEANS CONNECTING IN SERIES IN A CLOSED LOOP IN THE FOLLOWING SEQUENCE: THE RESERVOIR, THE HYDRAULIC PRESSURE MEANS, THE VALVE MEANS, THE ION EXCHANGE RESIN BED MEANS, THE CONDUCTIVITY CELL, AND THE CLEAN UP RESIN BED MEANS, READOUT MEANS ASSOCIATED WITH THE CONDUCTIVITY CELL, MEANS FOR DELIVERING TO THE SAID VALVE MEANS, AT MUTUALLY EXCLUSIVE TIMES, SAMPLE SOLUTION, AND STANDARD SOLUTION, AND A COMPUTER-CONTROLLER COORDINATING THE INTRODUCTIONS OF SAMPLE SOLUTION AND OF STANDARD SOLUTION WITH THE READ OUT MEANS.
Claim 3
Dependent Claim
16 words
The system as in claim 1 wherein each resin bed means is a single tubular column.
Claim 4
Dependent Claim
28 words
The system as in claim 1 wherein the ion exchange resin bed means consists of a first and a second ion exchange resin bed means connected in series.
Claim 5
Dependent Claim
22 words
The system as in claim 3 wherein the first and second ion exchange resin bed means are each a single tubular column.
Claim 6
Dependent Claim
38 words
The system as in claim 4 wherein the first column is charged with a cation exchange resin in easily elutable cation form and the second column is charged with an anion exchange resin in easily elutable anion form.
Claim 7
Dependent Claim
34 words
The system as in claim 5 wherein the easily elutable cation form is selected from lithium and sodium ion forms and the easily elutable anion form is selected from acetate and hydroxide ion forms.
Claim 8
Dependent Claim
38 words
The system as in claim 4 wherein the first column is charged with a cation exchange resin in the silver ion form and the second column is charged with a cation exchange resin in the hydrogen ion form.
Claim 9
Dependent Claim
24 words
The system as in claim 7 wherein the cation exchange resin in the second column is a homogeneously sulfonated copolymer of styrene and divinylbenzene.
Claim 10
Dependent Claim
17 words
The system as in claim 8 wherein the cation exchange resin is a low exchange capacity resin.
Claim 11
Dependent Claim
18 words
The system as in claim 1 wherein the ion exchange resin bed means is a single tubular column.
Claim 12
Dependent Claim
21 words
The system as in claim 10 wherein the column is charged with a cation exchange resin in easily elutable cation form.
Claim 13
Dependent Claim
21 words
The system as in claim 10 wherein the column is charged with an anion exchange resin in easily elutable anion form.
Claim 14
Dependent Claim
25 words
The system as in claim 1 wherein the readout means associated with the conductivity cell includes means for transmitting the readout to a remote location.
Claim 15
Dependent Claim
35 words
The system as in claim 1 wherein the means for delivering sample solution to the valve means includes means for selecting the sample solution from natural waters or a manufacturing plant effluent aqueous waste discharge.
Claim 16
Dependent Claim
47 words
The system as in claim 1 wherein the means for delivering sample solution and standard solution to the valve means also includes means for passing bactericidal solution through such delivery means at times mutually exclusive to the delivery of the sample solution and of the standard solution.
Claim 17
Dependent Claim
14 words
The system as in claim 1 wherein the hydraulic pressure means is a pump.
Claim 18
Dependent Claim
18 words
The system as in claim 1 wherein the clean up resin bed means is a single tubular column.
Claim 19
Dependent Claim
60 words
The system as in claim 17 wherein the single tubular column is charged with an ion exchange resin selected from the group consisting of: cation exchange resin in the hydrogen ion form, anion exchange resin in the hydroxide ion forms, and, a combination of cation exchange resin in the hydrogen ion form and anion exchange resin in the hydroxide form.
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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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |