US2583890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quantitative determination of metals
Assignee: CHEMISCHE FABRIK UETIKON
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Filing: 1946-04-08
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Granted: 1952-01-29
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Expires: 1966-04-08
Abstract
No abstract record available.
Inventors
- 👤 Schwarzenbach Gerold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:09
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A METHOD OF VOLUMETRICALLY DETERMINING METAL CATIONS IN SOLUTION WHICH COMPRISES TITRATING A MEASURED AMOUNT OF THE SOLUTION WITH A SOLUTION CONTAINING A KNOWN CONCENTRATION OF AN AMINO POLYCARBOXCYLIC ACID COMPOUND, SAID COMPOUND HAVING IN RELATION TO ONE BASIC NITROGEN ATOM MORE THAN ONE CARBOXYMETHYL GROUP DIRECTLY ATTACHED THERETO, UNTIL AND END-POINT DETECTABLE BY SUITABLE INDICATING MEANS IS REACHED, SAID END-POINT BEING THE POINT WHERE ALL OF THE AFORESAID METAL CATIONS ARE UNITED WITH THE ANIONS OF THE AMINO POLYCARBOXYLIC ACID COMPOUNDS TO FORM A COMPLEX ION THEREOF, THE AMOUNT OF AMINO POLYCARBOXYLIC ACID COMPOUND BEING A DIRECT MEASURE OF THE AFORESAID METAL CATIONS PRESENT IN SOLUTION
Claim 2
Independent Claim
107 words
A METHOD OF VOLUMETRICALLY DETERMINING METAL CATIONS IN SOLUTION WHICH COMPRISES TITRATING A MEASURED AMOUNT OF THE SOLUTION WITH A SOLUTION CONTAINING A KNOWN CONCENTRATION OF AN AMINO POLYCARBOXCYLIC ACID COMPOUND, SAID COMPOUND HAVING IN RELATION TO ONE BASIC NITROGEN ATOM MORE THAN ONE CARBOXYMETHYL GROUP DIRECTLY ATTACHED THERETO, UNTIL AND END-POINT DETECTABLE BY SUITABLE INDICATING MEANS IS REACHED, SAID END-POINT BEING THE POINT WHERE ALL OF THE AFORESAID METAL CATIONS ARE UNITED WITH THE ANIONS OF THE AMINO POLYCARBOXYLIC ACID COMPOUNDS TO FORM A COMPLEX ION THEREOF, THE AMOUNT OF AMINO POLYCARBOXYLIC ACID COMPOUND BEING A DIRECT MEASURE OF THE AFORESAID METAL CATIONS PRESENT IN SOLUTION
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-28 | 1955-07-30 | 1956-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-28 | 1959-07-30 | 1960-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-28 | 1963-07-30 | 1964-01-29 | $7700.00 | Window Closed / Lapsed |