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:
Dec. 01, 1992
Filed:
Oct. 23, 1989
Applicant:
Inventors:
Gino L De Rycke, Mortsel, BE;
Freddy Henderickx, Olen, BE;
Assignee:
Agea-Gevaert N. V., Mortsel, BE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; F21V / ; G03C / ;
U.S. Cl.
CPC ...
252584 ; 252588 ; 2523131 ; 430603 ; 430617 ; 430921 ; 359361 ;
Abstract
An aqueous silver sulfide sol is prepared which has an absorption spectrum such that its optical density at 360 nm is at least 100 times its optical density at 700 nm. The sol is ultrafine in particle size and is useful for the chemical sensitization of silver halide emulsions and for the preparation of development layers for the silver complex diffusion transfer copying process or the production of optical filters.