US4007228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted-2-nitro-paraphenylenediamines and processes for producing same
Assignee: L'Oréal SA
•
Filing: 1970-09-02
•
Granted: 1977-02-08
•
Expires: 1990-09-02
Abstract
Abstract The compound (2'-hydroxyethyl)-1-amino-2-nitro-(2'-hydroxyethyl)-4-methylamino benzene which can be used to dye live human hair.
Inventors
- 👤 Gregoire Kalopissis
- 👤 Andree Bugaut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:15
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/40; A61K8/41; A61K8/418; A61Q; A61Q5/00; A61Q5/06; A61Q5/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
2 words
(2'-hydroxyethyl)-1-amino-2-nitro-(2'-hydroxyethyl)-4-methylamino benzene.
Claim 2
Dependent Claim
2 words
(2'-hydroxyethyl)-1-amino-2-nitro-(2'-hydroxyethyl)-4-methylamino benzene.
Claim 3
Dependent Claim
76 words
The method of making a high purity (2'-hydroxy-ethyl)-1-amino-2-nitro-(2'-hydroxyethyl)-4-methylamino benzene of claim 1 which comprises the steps of reacting 1-amino-2-nitro-4-methyl-acetamino benzene with reactive amounts of chloroethylchloro-formiate to obtain the chloroethylic ester of (-2-nitro-4-methylacetamino) phenylcarbamic acid, deacetylizing the resulting product with deacetylating amounts of concentrated hydrochloric acid to obtain the chloroethylic ester of (2-nitro-4-methylamino)-phenylcarbamic acid, reacting this product with a potash solution to obtain (2'-hydroxyethyl)-1-amino-2-nitro-4-methylamino benzene, and then reacting this product with glycol halohydrine to produce (2'hydroxyethyl)-1-amino-2-nitro-(2'hydroxyethyl)-4-methylamino benzene.
Claim 4
Dependent Claim
11 words
The method of claim 2 in which said halohydrine is bromohydrine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |