Stiffener sheet and flexible printed circuit board using the same
US7985482B2 · kind B2 · utility
1Cited by
1References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2008 |
| Grant date | Jul 26, 2011 |
| Priority date | — |
| Expiry date | Feb 20, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A stiffener sheet for flexible printed flexible printed circuit boards, includes alternately laminated polyimide layers and polyamideimide layers, wherein a molecular structure of the polyamideimide is represented by the following formula:wherein Ar and Ar′ represents different substituted aromatic groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.