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. 25, 1997
Filed:
Jan. 26, 1996
Lyn M Eshelman, Rochester, NY (US);
David H Levy, Rochester, NY (US);
Paul J Madigan, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Spectrally sensitized tabular grain emulsions are disclosed exhibiting (1) increased speeds and (2) contrasts and speed-granularity relationships superior to those of conventional emulsions of the same average grain sizes. The tabular grains have {111} major faces, contain greater than 80 mole percent bromide, based on silver, and are substantially free of iodide, exhibit an average aspect ratio of greater than 50 and an average equivalent circular diameter of >10 micrometers, account for greater than 90 percent of total grain projected area, and have latent image forming chemical sensitization sites on their surfaces including epitaxially deposited silver halide protrusions of a face centered cubic rock salt crystal lattice structure forming epitaxial junctions with the tabular grains. The protrusions are restricted to those portions of the tabular grains (a) located nearest peripheral edges of and (b) accounting for less than 50 percent of the {111} major faces of the tabular grains. The protrusions contain silver iodide and a silver chloride concentration at least 10 mole percent higher than that of the tabular grains.