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:
Oct. 12, 1993
Filed:
Sep. 25, 1992
John R Shock, Princeton Junction, NJ (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A photographic silver halide emulsion comprising silver halide grains having a chloride content of at least 90 mole percent and a rhodium salt, wherein said grains have been sensitized with a black and white developing agent, provides a substantial improvement in bright room tolerance as compared to emulsions sensitized with more conventional sensitizing agents, without loss of speed or contrast. A process for improving the bright room tolerance of a photographic emulsion comprising silver halide grains having a chloride content of at least 90 mole percent and a rhodium salt comprises the step of sensitizing the grains with a black and white developing agent.