Patent Number: 7,687,886
App Number: 11/153,078
Assignee: MicroLink Devices, Inc.
Prior Art Cutoff Date: predating June 14, 2005
Summary: Patent discloses, among other things, an HBT with two collectors with different doping in order to increase on-state breakdown voltage.
Looking for prior art that discloses using a double collector structure with varying doping levels to achieve the breakdown voltages at the current densities shown in Fig. 5 of the patent (Not the Standard InGaP).