(under subclass 2) Processes and compositions therefore in which a physical property of a crystal or crystalline material is determined by means involving a chemical reaction.
(1) Note. This subclass includes gross determination of the crystallinity of a material e.g., polymer, etc., as well as a determination of the crystal habit of a compound by means of a chemical reaction.
(2) Note. The loss or gain of a water of crystallization is considered to be a chemical reaction while other alternations of crystal structure are not.
SEE OR SEARCH CLASS
29, Metal Working,
25.35, for the electrical measuring testing or sensing of piezoelectric crystals combined with the manufacture thereof.
73, Measuring and Testing, Digest 4 for physical test of piezoelectric properties. 117, Single-Crystal, Oriented-Crystal, and Epitaxy Growth Processes; Non-Coating Apparatus Therefor, for processes of measuring, testing, or sensing in combination with single crystal growth.
125, Stone Working,
12, and 13.01+ for apparatus and methods for cutting crystal which include the step of first examinating optically and working the crystal for axis orientation.
324, Electricity: Measuring and Testing,
109, for the electrical testing of a piezoelectric crystal.
356, Optics: Measuring and Testing,
30, for a process of optical testing of crystals including gems, piezoelectric and semiconductor crystals which may include nominal cutting or etching of the crystal.
378, X-Ray or Gamma Ray Systems or Devices, appropriate subclasses, 44 through 50 for the use of X-rays to determine chemical composition or crystal structure or a process of X-ray crystallography.
