Patent US6070590A successfully refreshed from Google Patents.
US2976122A
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Analysis of heavy metal ions and metal chelates of dialkyl dithiophosphoric acids
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1955-12-07
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Granted: 1961-03-21
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Expires: 1975-12-07
Abstract
No abstract record available.
Inventors
- 👤 Henry R Ertelt
- 👤 Stephen L Wythe
- 👤 Michael J Furey
- 👤 John K Appeldoorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:26
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/02; G01N31/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A METHOD FOR DETERMINING THE CONCENTRATION OF AN AQUEOUS SOLUTION OF A HEAVY METAL ION SELECTED FROM THE GROUP CONSISTING OF NICKEL, IRON, COBALT AND COPPER WHICH COMPRISES PRECIPITATING SAID HEAVY METAL ION FROM SAID AQUEOUS SOLUTION BY ADDING A WATER SOLUBLE METAL DIALKYL DITHIOPHOSPHATE, THE METAL BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METALS AND THE ALKYL RADICALS HAVING IN THE RANGE OF 3 TO 4 CARBON ATOMS; EXTRACTING THE PRECIPITATE CONTAINING SAID HEAVY METAL ION WITH A PREDETERMINED VOLUME OF A WATER IMMISCIBLE SOLVENT; AND DETERMINED THE CONCENTRATION OF THE HEAVY METAL ION RESPONSIVE TO THE COLOR OF THE SOLVENT EXTRACT, THE COLOR INTENSITY OF THE SOLVENT EXTRACT BEING DIRECTLY PROPORTION TO THE CONCENTRATION OF THE HEAVY METAL ION PRESENT THEREIN.
Claim 2
Independent Claim
127 words
A METHOD FOR DETERMINING THE CONCENTRATION OF AN AQUEOUS SOLUTION OF A HEAVY METAL ION SELECTED FROM THE GROUP CONSISTING OF NICKEL, IRON, COBALT AND COPPER WHICH COMPRISES PRECIPITATING SAID HEAVY METAL ION FROM SAID AQUEOUS SOLUTION BY ADDING A WATER SOLUBLE METAL DIALKYL DITHIOPHOSPHATE, THE METAL BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METALS AND THE ALKYL RADICALS HAVING IN THE RANGE OF 3 TO 4 CARBON ATOMS; EXTRACTING THE PRECIPITATE CONTAINING SAID HEAVY METAL ION WITH A PREDETERMINED VOLUME OF A WATER IMMISCIBLE SOLVENT; AND DETERMINED THE CONCENTRATION OF THE HEAVY METAL ION RESPONSIVE TO THE COLOR OF THE SOLVENT EXTRACT, THE COLOR INTENSITY OF THE SOLVENT EXTRACT BEING DIRECTLY PROPORTION TO THE CONCENTRATION OF THE HEAVY METAL ION PRESENT THEREIN.
References Cited (Backward Citations)
US2063629A
Cited
US2368000A
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US2346155A
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US2456692A
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US2410650A
Cited
US2637631A
Cited
US2798880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |