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Class Information
Number: 257/390
Name: Active solid-state devices (e.g., transistors, solid-state diodes) > Field effect device > Having insulated electrode (e.g., mosfet, mos diode) > Insulated gate field effect transistor in integrated circuit > Matrix or array of field effect transistors (e.g., array of fets only some of which are completed, or structure for mask programmed read-only memory (rom))
Description: Subject matter wherein the integrated circuit contains a two dimensional array of IGFETs, only some of which are completed devices, or the integrated circuit contains structure for a mask programmed read-only memory device.


Sub-classes under this class:

Class Number Class Name Patents
257/391 Selected groups of complete field effect devices having different threshold voltages (e.g., different channel dopant concentrations) 347


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Patent Number Title Of Patent Date Issued
5932909 Nonvolatile semiconductor memory device Aug. 3, 1999
5930663 Digital circuit with transistor geometry and channel stops providing camouflage against reverse engineering Jul. 27, 1999
5929494 Read only memory array and method of manufacturing the array Jul. 27, 1999
5925917 Contact programmable ROM and method of manufacturing the same Jul. 20, 1999
5920100 Multi-stage ROM structure Jul. 6, 1999
5920099 Read-only memory cell array and process for manufacturing it Jul. 6, 1999
5920101 Structure for making sub-lithographic images by the intersection of two spacers Jul. 6, 1999
5917224 Compact ROM matrix Jun. 29, 1999
5907167 Method and apparatus for providing ROM in an integrated circuit having update through single substance layer modification capability May. 25, 1999
5905289 Planarized metallurgy structure for a semiconductor and process of fabrication May. 18, 1999
5903036 Semiconductor device having MISFET SRAM cells in which active regions and gate electrodes are dimensioned for increasing storage node capacitances without increasing memory cell size May. 11, 1999
5894162 High density EPROM cell and process for fabricating same Apr. 13, 1999
5891781 Method for coding mask read-only memory Apr. 6, 1999
5883405 MOS transistor read-only memory device Mar. 16, 1999
5877537 Semiconductor device having first transistor rows with second transistor rows connected therebetween Mar. 2, 1999
5875138 Dynamic access memory equalizer circuits and methods therefor Feb. 23, 1999
5874746 TFT, method of making and matrix displays incorporating the TFT Feb. 23, 1999
5869863 memory having a trench type gate structure Feb. 9, 1999
5866928 Single digit line with cell contact interconnect Feb. 2, 1999
5864164 Multi-stage ROM structure and method for fabricating the same Jan. 26, 1999
5861635 Liquid crystal display including a coplanar line structure Jan. 19, 1999
5859460 Tri-state read-only memory device and method for fabricating the same Jan. 12, 1999
5852317 Method to reduce gate oxide damage due to non-uniform plasmas in read only memory arrays Dec. 22, 1998
5852318 Semiconductor device Dec. 22, 1998
5847441 Semiconductor junction antifuse circuit Dec. 8, 1998
5847426 Contactless flash EPROM using poly silicon isolation Dec. 8, 1998
5847420 Semiconductor integrated circuit having three wiring layers Dec. 8, 1998
5838046 Operating method for ROM array which minimizes band-to-band tunneling Nov. 17, 1998
5835409 Compact page-erasable EEPROM non-volatile memory Nov. 10, 1998
5834819 Semiconductor read-only memory device for permanent storage of multi-level coded data Nov. 10, 1998
5834818 Structure for making sub-lithographic images by the intersection of two spacers Nov. 10, 1998
5834851 SRAM having load transistor formed above driver transistor Nov. 10, 1998
5831314 Trench-shaped read-only memory and its method of fabrication Nov. 3, 1998
5825069 High-density semiconductor read-only memory device Oct. 20, 1998
5821592 Dynamic random access memory arrays and methods therefor Oct. 13, 1998
5821591 High density read only memory cell configuration and method for its production Oct. 13, 1998
5815433 Mask ROM device with gate insulation film based in pad oxide film and/or nitride film Sep. 29, 1998
5811862 Semiconductor device having a mask programmable memory and manufacturing method thereof Sep. 22, 1998
5804854 Memory cell array Sep. 8, 1998
5793086 NOR-type ROM with LDD cells and process of fabrication Aug. 11, 1998
5793087 Segmented non-volatile memory array having multiple sources Aug. 11, 1998
5789794 Fuse structure for an integrated circuit element Aug. 4, 1998
5783846 Digital circuit with transistor geometry and channel stops providing camouflage against reverse engineering Jul. 21, 1998
5777369 Bit-line pull-up circuit or static random access memory (SRAM) devices Jul. 7, 1998
5773867 Programmable hex-ROM with isolation transistor structure Jun. 30, 1998
5763925 ROM device having memory units arranged in three dimensions, and a method of making the same Jun. 9, 1998
5760454 Pattern form of an active region of a MOS type semiconductor device Jun. 2, 1998
5760452 Semiconductor memory and method of fabricating the same Jun. 2, 1998
5757054 Display unit May. 26, 1998
5754464 Mask ROM with field shield transistors functioning as memory cells and method of reading data thereof May. 19, 1998

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