US2967092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimetric determination of dissolved oxygen in low concentrations
Assignee: Individual
•
Filing: 1957-05-13
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Granted: 1961-01-03
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Expires: 1977-05-13
Abstract
No abstract record available.
Inventors
- 👤 Leonard S Buchoff
- 👤 Nathan M Ingber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:00
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/225; Y; Y10; Y10S; Y10S436/00; Y10S436/904; Y10T; Y10T436/00; Y10T436/20; Y10T436/207497; Y10T436/209163
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
125 words
A METHOD FOR DETERMINING MINUTE AMOUNTS OF OXYGEN DISSOLVED IN TEST WATER, THE OXYGEN BEING DISSOLVED IN QUANTITIES LESS THAN .02 PART PER MILLION, SAID METHOD COMPRISING MIXING THE EQUIVALENT OF: .018 GRAM OF INDIGO CARMINE AND 0.2 GRAM OF GLUCOSE WITH WATER TO MAKE 5 CUBIC CENTIMETERS OF SOLUTION, SUBSEQUENTLY ADDING TO THIS SOLUTION THE EQUIVALENT OF 75 CUBIC CENTIMETERS OF GLYCERINE AND 20 CUBIC CENTIMERS OF A 35-40 PERCENT SOLUTION OF POTASSIUM HYDROXIDE, AND LETTING THE RESULTING SOLUTION STAND FOR AT LEAST A FEW MINUTES, THEN MIXING IN A CLOSED CONTAINER THE EQUIVALENT OF ONE CUBIC CENTIMETER OF SAID RESULTANT SOLUTION WITH A PREDETERMINED AMOUNT OF THE TEST WATER TO OBTAINED A COLOR INDICATIVE OF THE AMOUNT OF OXYGEN DISSOLVED IN THE WATER.
References Cited (Backward Citations)
US2606102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |