With Pn Junction Isolation Patents (Class 257/544)
- Transistors of same conductivity type (e.g., npn) having different current gain or different operating voltage characteristics (Class 257/553)
- With connecting region made of polycrystalline semiconductor material (e.g., polysilicon base contact) (Class 257/554)
- Complementary bipolar transistor structures (e.g., integrated injection logic, I 2 L) (Class 257/555)