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Class Information
Number: 257/E29.31
Name: Active solid-state devices (e.g., transistors, solid-state diodes) > Semiconductors devices adapted for rectifying, amplifying, oscillating, or switching, capacitors, or resistors with at least one potential-jump barrier or surface barrier (epo) > Types of semiconductor device (epo) > Controllable by only signal applied to control electrode (e.g., base of bipolar transistor, gate of field-effect transistor) (epo) > Unipolar device (epo) > Field-effect transistor (epo) > With field effect produced by pn or other rectifying junction gate (i.e., potential barrier) (epo)
Description: This subclass is indented under subclass E29.242. This subclass is substantially the same in scope as ECLA classification H01L29/80.

Sub-classes under this class:

Class Number Class Name Patents
257/E29.315 With heterojunction gate (e.g., transistors with semiconductor layer acting as gate insulating layer) (epo) 185
257/E29.312 With pn junction gate (e.g., pn homojunction gate) (epo) 180
257/E29.311 With schottky drain or source contact (epo) 20
257/E29.317 With schottky gate (epo) 322

Patents under this class:

Patent Number Title Of Patent Date Issued
8637908 Borderless contacts in semiconductor devices Jan. 28, 2014
8492803 Field effect device with reduced thickness gate Jul. 23, 2013
8466495 Field effect transistor with reduced gate leakage current Jun. 18, 2013
8278691 Low power memory device with JFET device structures Oct. 2, 2012
8258576 Method of manufacturing a semiconductor device including epitaxially growing semiconductor epitaxial layers on a surface of semiconductor substrate Sep. 4, 2012
8227834 Semiconductor device Jul. 24, 2012
8207559 Schottky junction-field-effect-transistor (JFET) structures and methods of forming JFET structures Jun. 26, 2012
8198652 Field effect transistor with reduced gate leakage current Jun. 12, 2012
8115234 Semiconductor device Feb. 14, 2012
8110857 Low noise JFET Feb. 7, 2012
7705376 Sensor and method of manufacturing the same Apr. 27, 2010
7670888 Low noise JFET Mar. 2, 2010
7402845 Cascoded rectifier package Jul. 22, 2008
7307280 Memory devices with active and passive doped sol-gel layers Dec. 11, 2007
6420755 Semiconductor device having a field effect transistor and a method of manufacturing such a device Jul. 16, 2002
5789771 Camel-gate field-effect transistor with multiple modulation-doped channels Aug. 4, 1998
5334871 Field effect transistor signal switching device Aug. 2, 1994
5235210 Field effect transistor Aug. 10, 1993
4845534 Field effect semiconductor device Jul. 4, 1989
4821090 Compound semiconductor integrated circuit device Apr. 11, 1989
4807011 Semiconductor integrated circuit incorporating SITS Feb. 21, 1989
4795717 Method for producing semiconductor device Jan. 3, 1989
4782031 Method of making GaAs MOSFET with low source resistance yet having satisfactory leakage current by ion-implantation Nov. 1, 1988
4771324 Heterojunction field effect device having an implanted region within a device channel Sep. 13, 1988
4751562 Field-effect semiconductor device Jun. 14, 1988
4733283 GaAs semiconductor device Mar. 22, 1988
4714948 HEMT with epitaxial narrow bandgap source/drain contacts isolated from wide bandgap layer Dec. 22, 1987
4635343 Method of manufacturing GaAs semiconductor device Jan. 13, 1987
4628338 Semiconductor device Dec. 9, 1986
4590502 Camel gate field effect transistor device May. 20, 1986
4578343 Method for producing field effect type semiconductor device Mar. 25, 1986
4569119 Manufacturing method of Schottky gate FET Feb. 11, 1986
4566021 Semiconductor device Jan. 21, 1986
4559547 Semiconductor device Dec. 17, 1985
4546540 Self-aligned manufacture of FET Oct. 15, 1985
4532004 Method of manufacturing a semiconductor device Jul. 30, 1985
4503599 Method of fabricating field effect transistors Mar. 12, 1985
4503600 Process for manufacturing a buried gate field effect transistor Mar. 12, 1985
4472872 Method of fabricating a Schottky gate field effect transistor Sep. 25, 1984
4442445 Planar doped barrier gate field effect transistor Apr. 10, 1984
4400710 Semiconductor device Aug. 23, 1983
4377900 Method of manufacturing semiconductor device Mar. 29, 1983
4359754 Semiconductor device Nov. 16, 1982
4352238 Process for fabricating a vertical static induction device Oct. 5, 1982
4351099 Method of making FET utilizing shadow masking and diffusion from a doped oxide Sep. 28, 1982
4331967 Field effects semiconductor devices May. 25, 1982
4329772 Method for manufacturing a semiconductor device utilizing selective epitaxial growth and post heat treating May. 18, 1982
4129880 Channel depletion boundary modulation magnetic field sensor Dec. 12, 1978

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