Patent US3231471A successfully refreshed from Google Patents.
US3231471A
Expired / Lapsed
US
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2, 6-dioxypyridine and acid addition salts thereof for dyeing human hair
Assignee: Individual
•
Filing: 1962-11-01
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Granted: 1966-01-25
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Expires: 1982-11-01
Abstract
No abstract record available.
Inventors
- 👤 Lange Fritz-Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:31
CPC Classifications
A; A61; A61Q; A61Q5/00; A61Q5/10; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/49; A61K8/4906; A61K8/4926
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
A METHOD OF DYEING HAIR, COMPRISING THE STEP OF APPLYING TO HAIR WHICH IS TO BE DYED A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 2,6-DIOXYPYRIDINE, 2,6-DIOXYHYDROCHLORIDE, 2,6-DIOXYPYRIDINE SULFATE AND 2,6-DIOXYPYRIDINE PHOSPHATE.
References Cited (Backward Citations)
US2162458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |