(under the class definition) Processes for extracting, leaching or dissolving of a product not provided for above.
(1) Note. This subclass is the locus for patents whose claims and disclosure are not limited to a particular product, i.e., inorganic compound or nonmetallic element provided for in Class 423.
(2) Note. A patent in which the claims are not limited to extracting, leaching or dissolving a specific product will be classified on the basis of its disclosure as follows:
(a) If the disclosure includes a product for this class as well one provided for in another class (e.g., Class 260, etc.), the patent will be classified above in the appropriate subclass providing for the specific product and cross reference in this subclass 658.5, as well as in the other class, if appropriate.
(b) If the disclosure is limited to a product provided for in another class (e.g., Class 260 etc.), classification in the other class is proper.
(c) If the disclosure does not include a product provided for in Class 423, but includes a product provided for in each of a plurality of other classes (e.g., Class 208 and Class 260), patent is properly classified in this subclass 658.5 with appropriate cross references as required.
SEE OR SEARCH THIS CLASS, SUBCLASS: 8, 24, 54, 53, 70, 112, 139, 157, and 181, for processes utilizing liquid or liquid extraction to separate desired metallic compounds from mixtures.
20, 27, 68, 86, 98, 109, 131, 150, and 208, for processes utilizing leaching, washing, or dissolving to separate desired metallic compounds from mixtures.
SEE OR SEARCH CLASS
208, Mineral Oils: Processes and Products, appropriate subclasses for extracting mineral oil fractions and
311+, for processes of extracting mineral oil to dissolve and remove desired portions therefrom.
210, Liquid Purification or Separation,
632, and 633+ for a process purifying a liquid by solute or liquid extraction.
260, Chemistry of Carbon Compounds, appropriate subclasses for extracting particular compounds and
705, for processes of general application for extracting carbon compounds.
585, Chemistry of Hydrocarbon Compounds,
833+, for a process of purifying a hydrocarbon by solvent extraction.
