(under the class definition) Process in which a solid mineral hydrocarbonaceous material is treated by a chemical or physico-chemical procedure to improve its value as a fuel, or a product resulting from such a process.
(1) Note. Where a patent claims a process only, and the process yields other recoverable products than treated coal, see the search notes to the main class definition for the proper placement of such patent.
(2) Note. Where a treated coal solid product is the only product claimed, the patent is placed here (Class 44) regardless of any process claimed for its manufacture; however, where other products are also claimed, see (1) Note of the class definition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
490, and 608, for the treatment of peat and subbituminous coal, respectively.
500, for a treatment process designed to result in a particulate coal product.
SEE OR SEARCH CLASS
201, Distillation: Processes, Thermolytic, appropriate subclasses especially 6, and 8 for shaping or comminuting coal, respectively, prior to charging it to a carbonizing zone.
208, Mineral Oils: Processes and Products,
400+, for a coal liquefaction process, especially subclass 403 for a chemical modification of coal before hydrogenation.
423, Chemistry of Inorganic Compounds,
461, for the recovery of pure elemental carbon from coal.
585, Chemistry of Hydrocarbon Compounds,
943, for a collection of patents concerned with production of a relatively pure hydrocarbon from coal.
