Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Heterojunction bipolar transistor and method of producing the same










Image Number 7 for United States Patent #6924201.

A heterojunction bipolar transistor of the present invention is produced from a wafer including a substrate and a collector layer of a first conductivity type, a base layer of a second conductivity type and an emitter layer of the first conductivity type sequentially laminated on the substrate in this order. First, the wafer is etched up to a preselected depth of the collector layer via a first photoresist, which is formed at a preselected position on the emitter layer, serving as a mask. Subsequently, the collector layer etched with at least the sidewalls of the base layer and collector layer, which are exposed by the first etching step, and a second photoresist covering part of the surface of the collector layer contiguous with the sidewalls serving as a mask.








 
 
  Recently Added Patents
Method and device for determining processed image data about a surround field of a vehicle
Glow in the dark swim goggle frame and band
Wireless control kit for camera
Thermoforming sheet loading apparatus and method
Consistent retention and disposition of managed content and associated metadata
Coordinate locating method and apparatus
Cryptography on a simplified elliptical curve
  Randomly Featured Patents
Chrysanthemum plant named Grace
Electronic display to post gaming limits
Printer apparatus
Method and device for removal of NO.sub.x from engine exhaust
Method and system for a kernel lock validator
Method of monitoring suitability of a transmission path for transmission of digital data signals, and apparatus for use in carrying out the method
Method for inhibiting sloughing of unfragmented formation in an in situ oil shale retort
Gas treatment of molten metals
Container closure with tubing extending therefrom
Medicine cabinet