US PATENT SUBCLASS 423 / 458
.~.~.~.~ Gas or vapor only as infeed to process

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

414  DF  CARBON OR COMPOUND THEREOF {3}
445 R  DF  .~ Elemental carbon {7}
449.1  DF  .~.~ Carbon black (e.g., lampblack) {6}
450  DF  .~.~.~ Directly from fluid hydrocarbon only {6}
458.~.~.~.~ Gas or vapor only as infeed to process

DEFINITION

Classification: 423/458

(under subclass 450) Processes in which the hydrocarbon feed consists of a fluid which is normally in the gas or vapor state.

(1) Note. A normal gas or vapor is considered to be a compound having between 1 and 4 carbons only.

(2) Note. Excluded under this definition is a process in which a liquid had been vaporized before entering the reaction zone. The initial starting material must be a normal gas or vapor for this subclass; if liquid, classification is in subclass 450.

SEE OR SEARCH THIS CLASS, SUBCLASS:

450, for a process in which the initial feedstock comprises a liquid, a mixture of gas and liquid or either gas or liquid, claimed generically as a fluid.