Patent US3682783A successfully refreshed from Google Patents.
US3682783A
Expired / Lapsed
US
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Method for coulometric karl fischer titration
Assignee: Photovolt Corp
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Filing: 1971-03-15
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Granted: 1972-08-08
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Expires: 1991-03-15
Abstract
Abstract AN IMPROVED REAGENT COMPOSITION FOR COULOMETRIC TITRATION OF WATER BY THE KARL FISCHER REACTION COMPRISES IODINE, PYRIDINE, SULFUR DIOXIDE AND AN INERT ORGANIC SOLVENT, THE SULFUR DIOXIDE BEING PRESENT IN A CONCENTRATION OF ABOUT 25 TO ABOUT 50 PERCENT BY WEIGHT, AND CONVENIENTLY IN ABOUT A 30-FOLD MOLAR EXCESS OVER THE IODINE. THE REAGENT COMPOSITION PROVIDES RAPID COULOMETRIC TITRATIONS WITH MINIMAL CYCLING AT THE ENDPOINT.
Inventors
- 👤 Harald Dahms
- 👤 Gabor B Levy
- 👤 David M Seltzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:41
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/42; G01N27/44; G01N31/00; G01N31/16; G01N31/168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |