MALCOLM S PENMAN
Engineers in Gurnee, IL
License number
Pennsylvania PE034817E
Category
Engineers
Type
Professional Engineer
Address
Address
2
Gurnee, IL 60031
Pennsylvania
Pennsylvania
Professional information
Process For Producing An Ammonium Thiosulfate Product
US Patent:
5618658, Apr 8, 1997
Filed:
Aug 28, 1995
Appl. No.:
8/520212
Inventors:
Malcolm S. Penman - Gurnee IL
Edward C. Saunders - Oakland NJ
Peter R. Wardle - Wanaque NJ
Edward C. Saunders - Oakland NJ
Peter R. Wardle - Wanaque NJ
Assignee:
Fuji Hunt Photographic Chemicals, Inc. - Paramus NJ
International Classification:
G03C 538
US Classification:
430455
Abstract:
A substantially sulfur-free ammonium thiosulfate containing product can be produced by spray drying an aqueous solution containing ammonium thiosulfate and effective stabilizing amounts of both a carbonate component and a sulfite component under effective conditions to provide a substantially sulfur-free product. The carbonate component is selected from among ammonium carbonate or bicarbonate, an alkali metal carbonate or bicarbonate, or an alkaline metal carbonate or bicarbonate while the sulfite component is an ammonium sulfite or bisulfite, alkali metal sulfite or bisulfite, or an alkaline metal sulfite or bisulfite.