US2765218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analysis of sulfuric acid
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1953-08-07
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Granted: 1956-10-02
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Expires: 1973-08-07
Abstract
No abstract record available.
Inventors
- 👤 Emanuel M Amir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:58
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/80; Y; Y10; Y10T; Y10T436/00; Y10T436/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A METHOD FOR ANALYZING SUBSTANTIALLY HYDROCARBONFREE SUFLURIC ACID HAVING A STRENGTH IN THE RANGE OF BETWEEN 91% AND 99% H2SO4 CONTAMINATED WITH CARBONACEOUS MATERIAL AND OPAQUE TO LIGHT IN THE ULTRA-VIOLET AND HIGHER REGIONS OF THE VISIBLE SPECTRUM BUT PARTIALLY TRANSPARENT TO THE YELLOW AND RED WAVE LENGTHS WHICH COMPRISES DIVIDING SAID CONTAMINATED ACID INTO A FIRST AND SECOND STREAM, ADDING 0.1 ML. OF AN APPROXIMATELY 0.01 MOLAR SOLUTION OF ALIZARIN BLUE IN SULFURIC ACID HAVING A STRENGTH IN THE RANGE BETWEEN 91% AND 99% H2SO4 TO 25 ML. OF SAID SECOND STREAM, AND THEN SEPARATELY EXPOSING SAID FIRST STREAM AND SAID SECOND STREAM CONTAINING SAID ALIZARIN BLUE IN A SPECTROPHOTOMETER TO LIGHT HAVING A WAVE LENGTH IN THE RANGE FROM ABOUT 5000 TO 7,000 A. TO OBTAIN AN ELECTRICAL SIGNAL WHICH IS A MEASURE
Claim 2
Independent Claim
135 words
A METHOD FOR ANALYZING SUBSTANTIALLY HYDROCARBONFREE SUFLURIC ACID HAVING A STRENGTH IN THE RANGE OF BETWEEN 91% AND 99% H2SO4 CONTAMINATED WITH CARBONACEOUS MATERIAL AND OPAQUE TO LIGHT IN THE ULTRA-VIOLET AND HIGHER REGIONS OF THE VISIBLE SPECTRUM BUT PARTIALLY TRANSPARENT TO THE YELLOW AND RED WAVE LENGTHS WHICH COMPRISES DIVIDING SAID CONTAMINATED ACID INTO A FIRST AND SECOND STREAM, ADDING 0.1 ML. OF AN APPROXIMATELY 0.01 MOLAR SOLUTION OF ALIZARIN BLUE IN SULFURIC ACID HAVING A STRENGTH IN THE RANGE BETWEEN 91% AND 99% H2SO4 TO 25 ML. OF SAID SECOND STREAM, AND THEN SEPARATELY EXPOSING SAID FIRST STREAM AND SAID SECOND STREAM CONTAINING SAID ALIZARIN BLUE IN A SPECTROPHOTOMETER TO LIGHT HAVING A WAVE LENGTH IN THE RANGE FROM ABOUT 5000 TO 7,000 A. TO OBTAIN AN ELECTRICAL SIGNAL WHICH IS A MEASURE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |