US3159586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized solutions of metal-specific indicator dyes
Assignee: Gebr HEYL CHEMISCHE FABRIK K G
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Filing: 1961-05-24
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Granted: 1964-12-01
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Expires: 1981-05-24
Abstract
No abstract record available.
Inventors
- 👤 Wildenhayn Reginald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/16; G01N31/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
AN AQUEOUS INDICATOR SOLUTION OF A METAL SPECIFIC INDICATOR DYE OF THE O,O''-DIHYDROXYDIARYLAZO TYPE CONTAINING AS A STABILIZING AGENT A POLYHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE GLYCOLS AND POLYPROPYLENE GLYCOLS, HAVING A MOLECULAR WEIGHT UP TO 1000, IN AN AMOUNT OF AT LEAST 30 PERCENT BY WEIGHT OF THE SOLUTION.
Claim 2
Dependent Claim
53 words
AN AQUEOUS INDICATOR SOLUTION OF A METAL SPECIFIC INDICATOR DYE OF THE O,O''-DIHYDROXYDIARYLAZO TYPE CONTAINING AS A STABILIZING AGENT A POLYHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE GLYCOLS AND POLYPROPYLENE GLYCOLS, HAVING A MOLECULAR WEIGHT UP TO 1000, IN AN AMOUNT OF AT LEAST 30 PERCENT BY WEIGHT OF THE SOLUTION.
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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |