US2750326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and composition for dyeing hair
Assignee: Lever Brothers Co
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Filing: 1952-01-24
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Granted: 1956-06-12
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Expires: 1972-01-24
Abstract
No abstract record available.
Inventors
- 👤 Eckardt Wolfgang Max Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:30
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/40; A61K8/41; A61K8/418; A61Q; A61Q5/00; A61Q5/06; A61Q5/065; D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
THE METHOD OF DYEING HAIR ATTACHED TO THE SKIN WHICH COMPRISES TREATING THE HAIR AT A TEMPERATURE BETWEEN 20 AND 30* C. WITH A COMPOSITION CONSISTING ESSENTIALLY OF A NITRO DYE HAVING THE GENERAL FORMULA (NO2)MRXN(NHR'')P WHERE R IS AN AROMATIC RADICAL, X IS A RADICAL SELECTED FROM THE GROUP CONSISTING OF NH2 AND HYDROXYL GROUPS, R'' IS AN ALKYLOL GROUP HAVING ONE TO THREE CARBON ATOMS AND A SINGLE HYDROXYL GROUP, M IS AN INTEGER OF AT LEAST 1, P IS AN INTEGER OF AT LEAST 1, AND THE SUM OF N AND P IS AN INTEGER OF AT LEAST 2.
References Cited (Backward Citations)
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Cited
US1932901A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |