.~> Lead, zirconium, titanium or compound thereof containing
Unofficial Alpha Subclasses: R PZ
DEFINITION
Classification: 252/62.9
(under the class definition) Compositions specialized and designed for use as piezoelectric materials and processes of making said compositions.
(1) Note. A piezoelectric material, for the purpose of this definition, is defined as a material which exhibits an electrostatic polarization when subjected to mechanical stress or which exhibits a mechanical stress, tending to produce a deflection when subjected to electric stress.
(2) Note. Compositions, per se, are classified in this subclass when, by either disclosure or claim, the composition
is piezoelectric.
SEE OR SEARCH THIS CLASS, SUBCLASS:
567, and 570+, for miscellaneous dielectric compositions, which should be considered as a field of search because some dielectrics, such as those used in electrets (the electrostatic analogue of the permanent magnet) which exhibit permanent polarization are believed to inherently possess piezoelectric properties.
SEE OR SEARCH CLASS 23, Chemistry: Physical Processes,
295+, for processes of crystallizing inorganic polycrystalline chemical compounds; the products of these processes, and the seed crystals used in the processes, are classified as chemical compounds. Processes of detwinning crystals are classified in the crystallizing subclasses. Method of preventing decomposition of crystals by enclosing the crystals in an environment rich in the decomposition products so that the equilibrium tendency is against decomposition (as when an ammonium salt is surrounded with ammonia gas) are classified with the crystals. Also see subclass 273 for seed crystals combined with supports, which combination is classified as crystallizing apparatus.
29, Metal Working,
25.35, for methods of and apparatus for manufacturing piezoelectric devices.
117, Single-Crystal, Oriented-Crystal, and Epitaxy Growth Processes; Non-Coating Apparatus Therefor, for processes and non-coating apparatus (including seed crystal combined with support) for growing thereindefined single-crystal of all types of materials, including inorganic or organic. The products of these processes, and the seed crystals used in the processes, are classified as chemical compounds. Processes of detwinning crystals are classified in the crystallizing subclasses. Method of preventing decomposition of crystals by enclosing the crystals in an environment rich in the decomposition products so that the equilibrium tendency is against decomposition (as when an ammonium salt is surrounded with ammonia gas) are classified with the crystals. Apparatus for detwinning crystals are classified with the crystallizing apparatus as appropriate; for example, Class 117,
200+, for non-coating apparatus which forms a therein-defined single-crystal.
118, Coating Apparatus, generally provides for coating apparatus, including single-crystal (e.g., epitaxy) coating means, especially
400+, 500+, or 715+.
156, Adhesive Bonding and Miscellaneous Chemical Manufacture,
17, for treating piezoelectric materials with an etching composition.
260, Chemistry of Carbon Compounds, appropriate subclasses, for processes of crystallizing organic compounds, the process being classified with its product. The products of these processes, and also the seed crystals used in the process, are classified as chemical compounds. Organic compounds, per se, are classified in Class 260, even though claimed or disclosed as being piezoelectric, when the compound is not claimed as being shaped with respect to the piezoelectric property and where it is uncombined with piezoelectric structure. 310, Electrical Generator or Motor Structure,
311+, (e.g., 357+) for piezoelectric organic or inorganic compositions of particular shape where there is a disclosure that the shape is significant to the piezoelectric property; subclass 323.11, for a piezoelectric element forming a resonant structure used in a traveling wave motor constructed of a specific substance or compound.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
129+, where a chemical reaction means is provided and subclasses 245.1+ where a physical reaction means is provided. See Class 422, subclasses 129+ or 245.1+ for crystallizing apparatus not provided for elsewhere.
423, Chemistry of Inorganic Compounds, for inorganic compounds, per se, even though disclosed or claimed as being piezoelectric, where the compound is not claimed as being shaped with respect to the piezoelectric property and where it is not combined with piezoelectric structure.
501, Compositions: Ceramic, appropriate subclasses for ceramic compositions and ceramic dielectrics, such as those containing titanate compounds, glass, procelain, or steatite. A disclosure of or claim to piezoelectric properties results in classification in this subclass without a cross-reference to Class 501.
562, Organic Compounds,
580, for processes of crystallizing Rochelle salt.
