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:
Feb. 18, 1992
Filed:
Mar. 12, 1990
Nobutaka Goto, Hino, JP;
Shigeharu Koboshi, Hino, JP;
Naoki Takabayashi, Hino, JP;
Yoshiyuki Makida, Gifu, JP;
Konica Corporation, Tokyo, JP;
Abstract
The improved method and apparatus for recovering silver from a waste photographic processing solution, in which the waste solution is supplied into the cathode compartment of an electrolytic cell which is separated from an anode compartment by a diaphragm, and electrolysis is performed with the current density at cathode and the current concentration in the cathode compartment controlled in such a way that silver ions are reduced in said waste solution with the hydrogen bubbles evolved by electrolytic reaction, and the reduced silver ions are precipitated as silver grains in the waste photographic processing solution.