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Class Information
Number: 257/E21.4
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 the manufacture of unipolar device (epo) > Field-effect transistor (epo)
Description: This subclass is indented under subclass E21.394. This subclass is substantially the same in scope as ECLA classification H01L21/335.

Sub-classes under this class:

Class Number Class Name Patents
257/E21.405 Active layer is group iii-v compound, e.g., iii-v velocity modulation transistor (vmt), nerfet (epo) 18
257/E21.401 Using static field induced region, e.g., sit, pbt (epo) 58
257/E21.409 With an insulated gate (epo) 655
257/E21.403 With heterojunction interface channel or gate, e.g., hfet, higfet, sisfet, hjfet, hemt (epo) 221
257/E21.404 With one or zero or quasi-one or quasi-zero dimensional charge carrier gas channel, e.g., quantum wire fet; single electron trans istor (set); striped channel transistor; coulomb blockade device (epo) 120
257/E21.445 With pn junction or heterojunction gate (epo) 37
257/E21.45 With schottky gate, e.g., mesfet (epo) 69

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8709881 Direct chemical vapor deposition of graphene on dielectric surfaces Apr. 29, 2014
8710498 Display device and method of manufacturing the same Apr. 29, 2014
8674412 Contacts-first self-aligned carbon nanotube transistor with gate-all-around Mar. 18, 2014
8637374 Method of fabricating self-aligned nanotube field effect transistor Jan. 28, 2014
8624216 Planar electronic semiconductor device Jan. 7, 2014
8624313 Method of manufacturing semiconductor memory device Jan. 7, 2014
8618581 Nanofludic field effect transistor based on surface charge modulated nanochannel Dec. 31, 2013
8614466 Semiconductor for measuring biological interactions Dec. 24, 2013
8604541 Structure and fabrication process of super junction MOSFET Dec. 10, 2013
8604530 Electronic devices and systems, and methods for making and using the same Dec. 10, 2013
8604527 Electronic devices and systems, and methods for making and using the same Dec. 10, 2013
8597993 Electrostatic discharge (ESD) device and method of fabricating Dec. 3, 2013
8558219 Nanowire field effect transistors Oct. 15, 2013
8551821 Enhancement normally off nitride semiconductor device manufacturing the same Oct. 8, 2013
8541824 Electronic devices and systems, and methods for making and using the same Sep. 24, 2013
8525237 Electrically conductive polymer nanowires with incorporated viruses Sep. 3, 2013
8524562 Method for reducing Fermi-Level-Pinning in a non-silicon channel MOS device Sep. 3, 2013
8492803 Field effect device with reduced thickness gate Jul. 23, 2013
8482009 Silicon-on-insulator substrate with built-in substrate junction Jul. 9, 2013
8476684 Field effect transistors having improved breakdown voltages and methods of forming the same Jul. 2, 2013
8384145 Non-volatile memory device using hot-carrier injection Feb. 26, 2013
8373206 Biosensor apparatuses and methods thereof Feb. 12, 2013
8361894 Methods of forming FinFET semiconductor devices with different fin heights Jan. 29, 2013
8343842 Method for reducing plasma discharge damage during processing Jan. 1, 2013
8324018 Semiconductor device, electronic device, and method of manufacturing semiconductor device Dec. 4, 2012
8318568 Tunnel field effect transistor Nov. 27, 2012
8304760 Sidewall graphene devices for 3-D electronics Nov. 6, 2012
8298879 Methods of fabricating metal oxide or metal oxynitride TFTS using wet process for source-drain metal etch Oct. 30, 2012
8288798 Step doping in extensions of III-V family semiconductor devices Oct. 16, 2012
8288217 Stressor in planar field effect transistor device Oct. 16, 2012
8283709 Semiconductor structure Oct. 9, 2012
8273617 Electronic devices and systems, and methods for making and using the same Sep. 25, 2012
8268680 Transistor of semiconductor device and method of fabricating the same Sep. 18, 2012
8242585 Semiconductor device and method for manufacturing the same Aug. 14, 2012
8193592 MOSFET with asymmetrical extension implant Jun. 5, 2012
8183572 Compound semiconductor device and its manufacture method May. 22, 2012
8154010 Memory device and method of fabricating the same Apr. 10, 2012
8148213 Method of producing a biosensor Apr. 3, 2012
8124977 Localized compressive strained semiconductor Feb. 28, 2012
8120120 Embedded silicon germanium source drain structure with reduced silicide encroachment and contact resistance and enhanced channel mobility Feb. 21, 2012
8101486 Methods for forming isolated fin structures on bulk semiconductor material Jan. 24, 2012
8097905 Cascoded high voltage junction field effect transistor Jan. 17, 2012
8084307 Method for manufacturing thin film transistor Dec. 27, 2011
8048731 Method for reducing low frequency noise of transistor Nov. 1, 2011
8039357 Integrated circuitry and methods of forming a semiconductor-on-insulator substrate Oct. 18, 2011
8022450 Image sensor and method for manufacturing the same Sep. 20, 2011
8017457 Method of manufacturing semiconductor memory device Sep. 13, 2011
8008649 Incorporating gate control over a resonant tunneling structure in CMOS to reduce off-state current leakage, supply voltage and power consumption Aug. 30, 2011
8008694 Brightness enhancement method and apparatus of light emitting diodes Aug. 30, 2011
8003504 Structure and method for fabrication of field effect transistor gates with or without field plates Aug. 23, 2011

1 2 3

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