US PATENT SUBCLASS 423 / 648.1
.~ Elemental hydrogen

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

644  DF  HYDROGEN OR COMPOUND THEREOF {3}
648.1.~ Elemental hydrogen {6}
649  DF  .~.~> Ortho-para conversion
650  DF  .~.~> By decomposing hydrocarbon {1}
655  DF  .~.~> By reacting water with carbon monoxide {1}
657  DF  .~.~> By reacting water or aqueous solution with metal or compound thereof {1}
658.2  DF  .~.~> By direct decomposition of binary compound; e.g., chemical storage, etc.
658.3  DF  .~.~> By reaction of impurities in a stream containing elemental hydrogen

DEFINITION

Classification: 423/648.1

Elemental hydrogen:

(under subclass 644) Subject matter wherein the product is hydrogen in elemental form.

SEE OR SEARCH CLASS

48, Gas: Heating and Illuminating,

197+, for the manufacture of elemental hydrogen in association with other gases for use as a fuel.

204, Chemistry: Electrical and Wave Energy, for production of elemental hydrogen by a process included therein, especially

157.4+, for the synthesis of hydrogen by wave energy (e.g., photolysis, sonic or shock waves, etc.).

205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions, for production of elemental hydrogen by a process included therein, especially 628+, for the synthesis of hydrogen by electrolysis.

252, Compositions,

372+, for the manufacture of elemental hydrogen, in association with other gases, for uses other than as a fuel, e.g., as a feedstock to a chemical reaction, etc.