US4110378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reduction employing resin adsorbents
Assignee: Rohm and Haas Co
•
Filing: 1976-06-01
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Granted: 1978-08-29
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Expires: 1996-06-01
Abstract
Abstract This invention relates to a quantitative analytical method for the isolation and determination of 3-isothiazolones in aqueous or nonaqueous media. The method involves isolating the isothiazolone by adsorbing it on a support; treating the isothiazolone with a reducing agent thereby cleaving the ring; reacting the resulting sulfhydryl group with a color forming reagent whose color development is directly proportional to the concentration of the isothiazolone and measuring the isothiazolone concentration via a calibrated color comparator or colorimeter.
Inventors
- 👤 Wolfgang G. Geyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:28
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/14; Y10T436/141111; Y10T436/25; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A method for the reduction of a reducible functional group selected from --S--N--, --S--S--, >C═O, >C═NHNH--, --CHO, ##STR6## and --N 3 which comprises adsorbing the organic compound containing said reducible functional group on a polymeric macroreticular resin adsorbent and reducing the adsorbed functional group with an aqueous solution of sodium borohydride.
Claim 2
Independent Claim
51 words
A method for the reduction of a reducible functional group selected from --S--N--, --S--S--, >C═O, >C═NHNH--, --CHO, ##STR6## and --N 3 which comprises adsorbing the organic compound containing said reducible functional group on a polymeric macroreticular resin adsorbent and reducing the adsorbed functional group with an aqueous solution of sodium borohydride.
References Cited (Backward Citations)
US3172887A
Cited
US3159632A
Cited
US3106458A
Cited
US3351487A
Cited
US3935294A
Cited
US3718432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |