U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Icon_funbox Quotables

"The horse is here to stay, the automobile is only a novelty - fad."

President of Michigan Savings Bank ; 1903

Newsletter  PatentStorm News

Make the Most of Our Site

See this month's Top Inventors and Most Cited Patents.

Stay on top of the latest innovations by subscribing to an RSS feed.

Registered users: Manage your profile.

 

Class 75/635 - Recovering Silver(Ag) from photographic material


Subclass of Class 75 - Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
Definition: Process in which Silver (Ag) is obtained from photographic
No. of patents: 3
Last issue date: 09/18/2001


NumberTitleIssue Date
6290747Conversion of impure silver halide to ultra-pure silver metal
A method for preparing ultra-pure silver from a crude silver halide matrix containing metallic and/or non-metallic impurities, said method comprising; roasting the crude silver halide matrix to substantially remove carbonaceous material; treating the roas... 		09/18/2001
5695645Methods for removing silver from spent photoprocessing solution
Spent solutions from photographic processors are fed into a conduit (18) to which subsequently are added precipitating agents from a first source (22) and flocculating agents from a second source (28); so that, well grown or ripened clumps of flocculated ... 		12/09/1997
5008017Method for recovering metals from waste liquors
Waste liquors containing small amounts of silver salts are treated with aluminum hydroxide to produce a floc reduced in volume by the addition of an acid and mixed with a metal bicarbonate and metal carbonate in amounts sufficient to affect solidification... 		04/16/1991
 
Sign InRegister
Username  
Password   
forgot password?