High resolution screen printable resists
US4486466A · kind A · utility
19Cited by
10References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1982 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Jul 29, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/1105
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A resinous protective coating useful in the manufacture of printed circuit boards with circuit patterns having a resolution of at least 0.25 mm lines and spaces thereon. The protective coating comprises resins dissolved in solvents, wherein the coating upon being subjected to heat goes from a high viscosity solution to a gel and then to a solid or from a soft "gel-like" state into a solid. The protective coating is resistant to copper electroplating baths, adheres to insulating substrates, adhesive coated base materials as well as metallic substrates and is capable of withstanding the thermal shock of dip soldering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.