US3689221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorometric assay of primary amines
Assignee: F Hoffmann La Roche AG
•
Filing: 1970-10-21
•
Granted: 1972-09-05
•
Expires: 1990-10-21
Abstract
Abstract AND ANY OTHER ORGANIC COMPOUNDS CONTAINING A PRIMARY AMINO MOIETY. A HIGHLY SENSITIVE ASSAY TECHNIQUE FOR PRIMARY AMINECONTAINING COMPOUNDS UTILIZES FLUORESCENCE PRODUCED BY THE INTERACTION OF THE PRIMARY AMINE COMPOUND WITH NINHYDRIN AND AN ARYL ALKYL ALDEHYDE. A PREFERRED ARYL ALKYL ALDEHYDE FOR THE ASSAY TECHNIQUE IS PHENYLACETALDEHYDE. THE ASSAY IS USEFUL FOR THE QUALITATIVE AND QUANTITATIVE DETERMAINATION OF AMINO ACIDS, PEPTIDES, PROTEINS
Inventors
- 👤 Sidney Udenfriend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:14
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6428; G01N21/643
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |