US3697225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicator for the detection of cobalt ions
Assignee: Merck Patent GmbH
•
Filing: 1971-03-09
•
Granted: 1972-10-10
•
Expires: 1991-03-09
Abstract
Abstract AN INDICATOR FOR THE COLORIMETRIC DETECTION OF COBALT IONS IS FORMED BY IMPREGNATING AN ABSORBENT CARRIER WITH A COMPOSITION COMPRISING A WATER-SOLUBLE RHODANIDE SALT, AN ALKALI-METAL OR AMMONIUM THIOSULFATE, AN ALKALI METAL FLUORIDE AND ONE OR MORE OF EMULSIFIER AND/OR WETTING AGENT, A TERTIARY AMINE AND A QUATERNARY AMMONIUM SALT.
Inventors
- 👤 Dieter Schmitt
- 👤 Alfred Stein
- 👤 Wilhelm Baumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:15
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |