(under subclass 365) Subject matter where the device has three or more separate electrodes.
(1) Note. The electrodes may be spaced about in a single surface of the piezoelectric material, or may be on two or more different surfaces or one of the three or more electrodes may be interposed between two layers of piezoelectric material so as to form a "sandwich".
SEE OR SEARCH THIS CLASS, SUBCLASS:
331+, where the element has combined therewith means to transmit to or receive from the element mechanical force.
SEE OR SEARCH CLASS
331, Oscillators,
163, for crystal oscillator systems with a piezoelectric crystal having three or more electrodes in circuit.