US3567355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercaptans for boosting the dyeing of human hair with direct dyes
Assignee: Therachemie Chemische Therapeutische GmbH
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Filing: 1965-08-26
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Granted: 1971-03-02
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Expires: 1985-08-26
Abstract
Abstract A PROCESS IS DISCLOSED FOR IMPROVING THE COLORING OF HUMAN HAIR, ESPECIALLY LIVING HUMAN HAIR, WITH DIRECT DYES BY THE USE OF MERCAPTANS WHICH ARE INSOLUBLE OR DIFFICULTLY SOLUBLE IN WATER. THE MERCAPTANS ARE MERCAPTOCARBOXYLIC ACID ESTERS AND AMIDES. EMULSIONS OR DISPERSIONS OF THE MERCAPTANS CAN BE USED TO TREAT THE HAIR PRIOR TO DYEING OR THEY CAN BE COMBINED WITH THE DYEING COMPOSITION.
Inventors
- 👤 Karl-Josef Boosen
- 👤 Gunter Reese
- 👤 Peter Berth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:51
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/46; A61Q; A61Q5/00; A61Q5/06; A61Q5/065; A61K2800/00; A61K2800/40; A61K2800/42; A61K2800/43; A61K2800/432
Claims Analysis
Total Claims: 0
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |