Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Physics
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










 
 
  Recently Added Patents
Mobile terminal and method for displaying information
Display device and projector
Methods and compositions for inhibiting progression to chronic cardiac failure
Inhibitors of human immunodeficiency virus replication
Drugs for prophylaxis or mitigation of taxane-induced neurotoxicity
Phenethanolamine derivatives for treatment of respiratory diseases
Reovirus for the treatment of cellular proliferative disorders
  Randomly Featured Patents
Sensor device usable as a switch
Rose plant Dicrevival
High track density media with optical servo tracks and method and apparatus for inscribing the tracks on the media
Methods, systems and agreements for increasing the likelihood of repayments under a financing agreement for renewable energy equipment
Manufacturing method of layered core
Nonvolatile semiconductor device
Gamma-ray microscopy methods
Bonded and tufted nonwovens II, methods for their manufacture and uses
Paper sheet manipulating apparatus and paper sheet transaction apparatus
Twin-roll machine, in particular for comminuting a bed of material