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Class Information
Number: 257/E21.355
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) > Multi-step process for manufacture of device of bipolar type, e.g., diodes, transistors, thyristors, resistors, capacitors) (epo) > Device comprising one or two electrodes, e.g., diode, resistor or capacitor with pn or schottky junctions (epo) > Diode (epo) > Break-down diode, e.g., zener diode, avalanche diode (epo)
Description: This subclass is indented under subclass E21.352. This subclass is substantially the same in scope as ECLA classification H01L21/329B4.










Sub-classes under this class:

Class Number Class Name Patents
257/E21.357 Avalanche diode (epo) 23
257/E21.356 Zener diode (epo) 56


Patents under this class:

Patent Number Title Of Patent Date Issued
8530953 Power MOS transistor device and switch apparatus comprising the same Sep. 10, 2013
8497167 EDS protection diode with pwell-nwell resurf Jul. 30, 2013
8492866 Isolated Zener diode Jul. 23, 2013
8236625 Method of forming a multi-channel ESD device Aug. 7, 2012
8217419 Semiconductor device Jul. 10, 2012
8198684 Semiconductor device with drain voltage protection for ESD Jun. 12, 2012
8110448 Two terminal multi-channel ESD device and method therefor Feb. 7, 2012
8089095 Two terminal multi-channel ESD device and method therefor Jan. 3, 2012
8053808 Layouts for multiple-stage ESD protection circuits for integrating with semiconductor power device Nov. 8, 2011
7812367 Two terminal low capacitance multi-channel ESD device Oct. 12, 2010
7772600 Light emitting device having zener diode therein and method of fabricating the same Aug. 10, 2010
7719029 Negative feedback avalanche diode May. 18, 2010
7642599 Semiconductor device and junction termination structure Jan. 5, 2010
7612431 Trench polysilicon diode Nov. 3, 2009
7544545 Trench polysilicon diode Jun. 9, 2009
7199403 Semiconductor arrangement having a MOSFET structure and a zener device Apr. 3, 2007
6791161 Precision Zener diodes Sep. 14, 2004
6429500 Semiconductor pin diode for high frequency applications Aug. 6, 2002
6376321 Method of making a pn-junction in a semiconductor element Apr. 23, 2002
5632910 Multilayer resist pattern forming method May. 27, 1997
5130261 Method of rendering the impurity concentration of a semiconductor wafer uniform Jul. 14, 1992











 
 
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