Agent for oxidative dyeing of hair
Abstract
Abstract Use is made in the oxidative dyeing of hair of a preliminary coloring stage of the general formula ##STR1## wherein R signifies COOR', CONH 2 , CONHR', CONR' 2 , CONH--NH 2 , CONH--OH, CN, CH 2 OH, CHO, CH(OH)(OR'), CH(OR') 2 and R' represents an alkyl group with 1 to 5 carbon atoms. The preliminary coloring stages as per formula (I) may be contained in the hair dyeing agents singly or in a mixture with known preliminary coloring stages and/or direct-acting hair dyeing agents. The hair dyeing agents may, in particular, additionally contain amino acids present in nature, their esters and/or their amides. The hair dyeing agents as described, are well compatible physiologically and it will particularly be brown to reddish-brown colorings having a natural effect, that may be obtained by their use.
Inventors
- 👤 Heinrich Bachmann
- 👤 Plato Portmann
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |