Resources Contact Us Home
Browse by Category: Main > Physics
Class Information
Number: 257/E21.188
Name: Active solid-state devices (e.g., transistors, solid-state diodes) > Processes or apparatus adapted for manufacture or treatment of semiconductor or solid-state devices or of parts thereof (epo) > Manufacture or treatment of semiconductor device (epo) > Device having at least one potential-jump barrier or surface barrier, e.g., pn junction, depletion layer, carrier concentration layer (epo) > Device having semiconductor body comprising group iv elements or group iii-v compounds with or without impurities, e.g., doping materials (epo) > Manufacture of electrode on semiconductor body using process other than by epitaxial growth, diffusion of impurities, alloying of impurity materials, or radiation bombardment (epo) > Manufacture or post-treatment of electrode having a capacitive structure, i.e., gate structure for field-effect device (epo) > Heterojunction gate structure (epo)
Description: This subclass is indented under subclass E21.176. This subclass is substantially the same in scope as ECLA classification H01L21/28B5.

Sub-classes under this class:

Class Number Class Name Patents
257/E21.189 For charge-coupled device (epo) 35

Patents under this class:

Patent Number Title Of Patent Date Issued
7488638 Method for fabricating a voltage-stable PMOSFET semiconductor structure Feb. 10, 2009
7297589 Transistor device and method Nov. 20, 2007
7271422 Semiconductor optical device Sep. 18, 2007

  Recently Added Patents
Holding structure for a touch panel
Nanowire structured photodiode with a surrounding epitaxially grown P or N layer
Vehicle and method for controlling vehicle
Paper product with surface pattern
Head shield
Random access point (RAP) formation using intra refreshing technique in video coding
Apparatus and method for multiplying frequency of a clock signal
  Randomly Featured Patents
Image photographic apparatus
Ventilating dehumidifying system using a wheel for both heat recovery and dehumidification
Current limit control with current limit detector
Method of assembling a modular snowmobile platform
Mirror-grating tuning arrangement for high resolution lasers
Image forming apparatus
Garbage collection via multiobjects
Flash memory device having multi-level cell and reading and programming method thereof
Make-up set and cosmetic storage case
Vibration-free hydraulic power system