(under subclass 311) Piezoelectric noncrystalline materials and elements in which the direction of polarization is significant with respect to the piezoelectric property of the material and/or in adopting the element to its intended function.
(1) Note. This subclass may contain methods of polarizing materials, per se, wherein such polarizing produces a piezoelectrically active element.
(2) Note. This subclass includes noncrystalline piezoids such as amorphous quartz, or quartz crystals in a binder which may then have various axis aligned.
SEE OR SEARCH CLASS
29, Metal Working,
25.35, for methods of making piezoelectric devices which may include the step of polarizing.
252, Compositions, 62.9, and the classes specified in the notes thereto for piezoelectric compositions.
361, Electricity: Electrical Systems and Devices,
233, for methods of treating articles with electric energy which may include polarizing.
427, Coating Processes,
457+, and 472 for polarization or oriented vapor deposition of a possibly piezoelectric element.
