Granular p-phenylenediamine color developing agent
US3981732A · kind A · utility
11Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1974 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | Apr 9, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/265
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for preparing a granular color developing agent, which comprises kneading a mixture of at least one excipient selected from the group consisting of water and lower alcohols and a p-phenylenediamine color developing agent, and granulating the mixture is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.