US PATENT SUBCLASS 75 / 417
.~.~.~.~ Obtaining metal from photographic waste


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}
414  DF  .~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7}
416  DF  .~.~.~ Combined with step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.) {8}
417.~.~.~.~ Obtaining metal from photographic waste


DEFINITION

Classification: 75/417

Obtaining metal from photos:graphic waste:

(under subclass 416) Process wherein the source of metal is photos:graphic waste.

(1) Note. Examples of photos:graphic waste are scrap film and spent photos:graphic solutions. The metal recovered is usually silver.

SEE OR SEARCH CLASS

430, Radiation Imagery Chemistry: Process, Composition, or Product Thereof, for a process which includes a photos:graphic step or which prepares a composition for that class combined with a step of recovering metal. An example of a process for Class 430 is a process of recovering silver from a photos:graphic developing solution to regenerate the solution for further use.