Electrets, i.e. having a permanently-polarised dielectric

Introduced: September 1968

Full Title

Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture > Electrets, i.e. having a permanently-polarised dielectric

Of 3 combined children, 0 exist in both systems.

3 codes are CPC-only extensions.

Child Classifications

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H01G 7/021 +1 CPC CPC only CPC only
H01G 7/025 +1 CPC CPC only CPC only
H01G 7/028 CPC only CPC only