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:
Mar. 31, 1981
Filed:
Dec. 31, 1979
Applicant:
Inventors:
Carl M Berke, Boston, MA (US);
Barbara A Baughman, Cambridge, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C / ;
U.S. Cl.
CPC ...
106-128 ; 106-105 ; 106135 ; 106137 ; 2523 / ; 430247 ;
Abstract
Noble metal silver-precipitating nuclei are prepared by reducing a noble metal salt or complex in the presence of a first polymer with a Sn.degree. colloid formed by the non-aqueous borohydride reduction of a tin salt in the presence of an organic solvent for the tin salt and a nitrogen-containing metal chelating polymer. The invention is also directed to film units employing said nuclei.