US3591638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for n-methylating nitroanilines and compounds prepared thereby
Assignee: P&G Hair Care Holding Inc
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Filing: 1968-05-13
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Granted: 1971-07-06
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Expires: 1988-05-13
Abstract
Abstract N-METHYLATING NITROANILINES BY REACTING NITROANILINES WITH A MIXTURE CONTAINING FORMALDEHYDE OR PARAFORMALDEHYDE A ND SULFURIC ACID; COMPOUNDS PREPARED BY THIS PROCESS BEING USEFUL AS HAIR DYES.
Inventors
- 👤 Alexander Halasz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:25
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
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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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |