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Class Information
Number: 257/E21.293
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) > Treatment of semiconductor body using process other than deposition of semiconductor material on a substrate, diffusion or alloying of impurity material, or radiation treatment (epo) > To change their surface-physical characteristics or shape, e.g., etching, polishing, cutting (epo) > To form insulating layer thereon, e.g., for masking or by using photolithographic technique (epo) > Inorganic layer (epo) > Inorganic layer composed of nitride (epo) > Of silicon nitride (epo)
Description: This subclass is indented under subclass E21.292. This subclass is substantially the same in scope as ECLA classification H01L21/318B.










Patents under this class:
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Patent Number Title Of Patent Date Issued
3997368 Elimination of stacking faults in silicon devices: a gettering process Dec. 14, 1976
3979768 Semiconductor element having surface coating comprising silicon nitride and silicon oxide films Sep. 7, 1976
3979613 Multi-terminal controlled-inversion semiconductor devices Sep. 7, 1976
3935117 Photosensitive etching composition Jan. 27, 1976

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