Patent ID: 11917901
Assignee: UDC IRELAND LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 17:
18. The compound of claim 1, wherein the structure of formula (3) is selected from the group consisting of formulae (3-A), (3-B), (3-C), (3-D), and (3-E):, wherein
A1 is C(R3)2,— or NR3;
A2 is O or NR3;
A3 is NR3; and
R1 and R3 are defined as in claim 1, and
the structure of formula (4) is selected from the group consisting of formulae (4-A), (4-B) and (4-C):,