Patent US3071446A successfully refreshed from Google Patents.
US3071446A
Expired / Lapsed
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Determination of tetrahydrocarbon lead impurities in gases
Assignee: Ethyl Corp
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Filing: 1962-02-23
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Granted: 1963-01-01
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Expires: 1982-02-23
Abstract
No abstract record available.
Inventors
- 👤 Louis J Snyder
- 👤 Samuel R Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:55
CPC Classifications
G; G01; G01N; G01N31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN THE COLLECTION AND DETERMINATION OF TRACE QUANTITIES OF TETRAHYDROCARBON LEAD IMPURITIES IN GASEOUS FLUIDS, SAID METHOD COMPRISING CONTACTING A SAMPLE OF GAS WITH AN IODINE REAGENT TO FORM A LEAD IODINE REACTION PRODUCT, AND THEREAFTER DETERMINING THE THUS FORMED LEAD IODIDE BY THE DITHIZONE METHOD, THE IMPROVEMENT CONSISTING OF PASSING THE GAS SAMPLE THROUGH A TERTIARY LAYER CONTACTING SYSTEM, THE LAYERS THEREOF CONSISTING OF A FIRST AND THIRD LAYER OF INERT FIBROUS MATERIAL AND A MIDDLE LAYER OF ANHYDROUS, ELEMENTAL IODINE CRYSTALS, AND THEREAFTER PASSING AQUEOUS POTASSIUM IODIDE SOLUTION THROUGH SAID TERTIARY LAYER SYSTEM, THEREBY ESTABLISHING AN AQUEOUS SOLUTION HAVING LEAS IODIDE AND ELEMENTAL IODINE THEREIN AND THEREAFTER ANALYZING SAID AQUEOUS SOLUTION BY THE DITHIZONE METHOD.
Claim 2
Dependent Claim
117 words
IN THE COLLECTION AND DETERMINATION OF TRACE QUANTITIES OF TETRAHYDROCARBON LEAD IMPURITIES IN GASEOUS FLUIDS, SAID METHOD COMPRISING CONTACTING A SAMPLE OF GAS WITH AN IODINE REAGENT TO FORM A LEAD IODINE REACTION PRODUCT, AND THEREAFTER DETERMINING THE THUS FORMED LEAD IODIDE BY THE DITHIZONE METHOD, THE IMPROVEMENT CONSISTING OF PASSING THE GAS SAMPLE THROUGH A TERTIARY LAYER CONTACTING SYSTEM, THE LAYERS THEREOF CONSISTING OF A FIRST AND THIRD LAYER OF INERT FIBROUS MATERIAL AND A MIDDLE LAYER OF ANHYDROUS, ELEMENTAL IODINE CRYSTALS, AND THEREAFTER PASSING AQUEOUS POTASSIUM IODIDE SOLUTION THROUGH SAID TERTIARY LAYER SYSTEM, THEREBY ESTABLISHING AN AQUEOUS SOLUTION HAVING LEAS IODIDE AND ELEMENTAL IODINE THEREIN AND THEREAFTER ANALYZING SAID AQUEOUS SOLUTION BY THE DITHIZONE METHOD.
References Cited (Backward Citations)
US2366953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |