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:
Aug. 23, 1977
Filed:
Sep. 13, 1974
Isao Shimamura, Minami-ashigara, JA;
Haruhiko Iwano, Minami-ashigara, JA;
Fuji Photo Film Co., Ltd., Minami-ashigara, JA;
Abstract
Ferricyanide and/or ferrocyanide ions are effectively removed from waste photographic treating solutions by contacting the solutions with weakly basic anion exchange resins. Improved results are obtained with the salt form of the weakly basic anion exchange resin when contacting takes place in the presence of a compound having a buffering action at a pH of 5 to 9, e.g., in the presence of boric acid, metaboric acid or a water soluble borate. Upon regeneration of the anion exchange resin the eluted ions can be reused as a photographic processing solution, e.g., a bleaching solution, with the addition of make up components.