Electrochemically treated photo-lithographic plates
US4152158A · kind A · utility
10Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1977 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Nov 21, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41N3/034
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
There are disclosed herein lithographic plates having an aluminum base the surface of which has been made porous and hardened first by an alternating current anodization in a hydrochloric acid electrolyte and then by a direct current anodization in a sulfuric acid electrolyte.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.