• All sections
• H - Electricity
• H01L - Semiconductor devices not covered by class
• H01L 21/04 - Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer

Patent holdings for IPC class H01L 21/04

Total number of patents in this class: 2149

10-year publication summary

Principal owners for this class