The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1995
Filed:
Dec. 30, 1993
Applicant:
Inventors:
Eddy Michiels, Duffel, BE;
Frank Michiels, Arendonk, BE;
Dmitry A Topchiev, Moscow, SU;
Gennady G Kardash, Moscow, SU;
Assignee:
AGFA-Gevaert, N.V., Mortsel, BE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ; C02F / ; C02F / ;
U.S. Cl.
CPC ...
210669 ; 210727 ; 210729 ; 210732 ; 210734 ; 210912 ;
Abstract
A process is disclosed for the purification of waste water containing a silver compound, comprising the steps of (1) adding to said waste water a salt of a poly(guanidine) or poly(biguanidine) polymer (2) adding a flocculant, and (3) filtrating the formed flocculate. The invention is particularly suitable for the removal of silver from the effluent of a photographic processor, and more specifically the effluent of a processor of wash-off materials, said effluent also containing gelatin. A most preferred poly(guanidine) compound is poly(hexamethyleneguanidine) hydrochloride.