Resist stripping process
US6440647B1 · kind B1 · utility
10Cited by
14References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 3, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Oct 31, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/0073
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process for removing patterned negative working resist from the surface of a substrate during manufacture of printed wiring boards is disclosed. The process includes the steps of contacting the patterned resist with a stripping solution containing an alkalinity source as well as a source of ammonium ions. The stripping solution is characterized in that it does not contain volatile organic compounds (VOCs).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.