US PATENT SUBCLASS 75 / 711
.~.~.~ Using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.)

Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

330  DF  PROCESSES {9}
392  DF  .~ Producing or treating free metal {10}
710  DF  .~.~ Below 300 degrees C {2}
711.~.~.~ Using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.) {11}
712  DF  .~.~.~.~> Involving mining or in situ operation
713  DF  .~.~.~.~> From photography material
714  DF  .~.~.~.~> From electrolytic or cementation slime
715  DF  .~.~.~.~> Removing coating to recover free metal from substrate or coating {1}
717  DF  .~.~.~.~> Reducing to free metal with gas {2}
721  DF  .~.~.~.~> Utilizing organic reducing agent
722  DF  .~.~.~.~> Involving organic compound containing metal or organic agent for agglomerating metal {1}
724  DF  .~.~.~.~> Displacing by another metal (i.e., electromotive series) {4}
739  DF  .~.~.~.~> Utilizing chemical agent to precipitate free metal {2}
742  DF  .~.~.~.~> Cleaning, leaching, or dissolving of Mercury(Hg)
743  DF  .~.~.~.~> With leaching or dissolving {1}

DEFINITION

Classification: 75/711

Using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.):

(under subclass 710) Process wherein a nonmetallic material which is a liquid under standard conditions is used at any stage in the production of free metal.

(1) Note. The use of a microorganism during the production of free metal is proper for Class 75.

SEE OR SEARCH THIS CLASS, SUBCLASS:

343+, for processes utilizing a nonmetallic liquid to produce or to treat free metal in powder form.

416+, for processes at 300 degrees C or greater combined with a step utilizing a nonmetallic liquid.

SEE OR SEARCH CLASS

134, Cleaning and Liquid Contact With Solids, for cleaning and liquid contact of metalliferous materials, per se.

(1) Note. Any process recovering free metal from the contacting liquid or from the metal substrate by chemical reduction belongs in Class 75 even though cleaning is involved. 204, Chemistry: Electrical and Wave Energy, for electrical and wave energy processes and apparatus.

(1) Note. Patents including a claim or claims classifiable in Class 204 and equally classifiable in Class 75 are classified as originals in Class 75 and cross-referenced to Class 204.

(2) Note. In a claim containing both Class 204 and Class 75 operation, the patent is placed as an original in Class 75 if, in a branch of the process, it is essential to perform the Class 204 operation before the Class 75 free metal separation. If, however, in a branch of the process, it is essential to perform the Class 75 free metal separation before the Class 204 operation, the original is placed in

Class 204 and crossed to Class 75.

(3) Note. The measurement of electrical potential (i.e., millivolts) is not sufficient to take a Class 75 process to Class 204 as an original.

(4) Note. See the Class 204 definition, References to Other Classes, for an expansion of the class line between Class 75 and Class 204, including a superiority listing of classes providing for various metals, alloys, and metal stocks and methods of manufacturing them.

205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions, appropriate subclasses for electrolytic treatment, especially subclasses 334+ for electrolytic synthesis in general, subclasses 557+ for electrolytic preparation of a metal alloy, and subclasses 560+ for electrolytic preparation of free metal.

210, Liquid Purification or Separation, for processes of removing metal ions from solution to purify the liquid. However, processes that produce a free metal go to Class 75 as original and are crossed to Class 210 if purification of a liquid is involved.

423, Chemistry of Inorganic Compounds, for chemical processes of treating metalliferous material to obtain a metal containing compound, processes that involve production of metal compounds or extracting, leaching or dissolving processes utilizing chemical treatment which do not produce free metal.

(1) Note. Patents including claims classifiable in Class 423 and equally comprehensive claims classifiable in Class 75 are classified as original in Class 75 and cross-referenced to Class 423.

(2) Note. Hydrometallurgical processes recovering metal values go to Class 423. However, if it can be determined conclusively that free (i.e., zero valent) metal is the metal value obtained, the patent is placed in Class 75.

427, Coating Processes, for processes of coating metal onto metallic substrates wherein the intention is to manufacture a coated product per se. However, if the intention is recovery of free metal by electromotive displacement wherein the metallic substrate dissolves as the free metal precipitates onto the substrate, proper classification goes to Class 75 even if a coated product is involved. 435, Chemistry: Molecular Biology and Microbiology, for processes employing a microorganism that do not involve the production of free metal.

502, Catalyst, Solid Sorbent, or Support Therefor: Product or Process of Making, for processes of making or regenerating a metal catalyst such as by utilizing a liquid wherein the

metal is specifically structured to catalyze a reaction or sorb a component (e.g., Raney nickel, etc.).