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Class Information
Number: 257/E33.048
Name: Active solid-state devices (e.g., transistors, solid-state diodes) > Light emitting semiconductor devices having a potential or a surface barrier, processes or apparatus peculiar to the manufacture or treatment of such devices, or of parts thereof > Device characterized by their operation (epo) > Having heterojunction or graded gap (epo)
Description: This subclass is indented under subclass E33.044. This subclass is substantially the same in scope as ECLA classification H01L33/00D3.

Sub-classes under this class:

Class Number Class Name Patents
257/E33.05 Comprising only group ii-iv compound (epo) 13
257/E33.049 Comprising only group iii-v compound (epo) 244

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
4302763 Semiconductor device Nov. 24, 1981
4171996 Fabrication of a heterogeneous semiconductor structure with composition gradient utilizing a gas phase transfer process Oct. 23, 1979
4158849 Heterojunction semiconductor device Jun. 19, 1979
4117504 Heterogeneous semiconductor structure with composition gradient and method for producing same Sep. 26, 1978

1 2

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