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:
Jan. 23, 1996
Filed:
Aug. 04, 1994
Applicant:
Inventors:
Alberto Vacca, Carcare, IT;
Paolo Barletta, Merana, IT;
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ;
U.S. Cl.
CPC ...
430569 ; 430642 ; 430627 ; 430634 ; 430635 ; 430636 ;
Abstract
A method is disclosed of preparing washed silver halide photographic emulsions wherein silver halide grain formation is effected in the presence of an acid-coagulable gelatin derivative or a mixture of gelatin and an acid-coagulable gelatin derivative and coagulation of the emulsion occurs in the presence of ionic copolymers of styrene sulfonic acid and maleic acid.