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:
Jun. 14, 1994
Filed:
Aug. 25, 1993
Gary L House, Victor, NY (US);
Thomas B Brust, Rochester, NY (US);
Debra L Hartsell, Rochester, NY (US);
Donald L Black, Webster, NY (US);
Michael G Antoniades, Rochester, NY (US);
Jerzy A Budz, Fairport, NY (US);
Yun C Chang, Rochester, NY (US);
Roger Lok, Rochester, NY (US);
Sherrill A Puckett, Rochester, NY (US);
Allen K Tsaur, Fairport, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Silver halide emulsions are disclosed in which at least 50 percent of total grain projected area is accounted for by tabular grains (1) bounded by {100} major faces having adjacent edge ratios of less than 10, (2) each having an aspect ratio of at least 2, and (3) internally at their nucleation site containing iodide and at least 50 mole percent chloride. The emulsions are prepared by a process comprised of the steps of (a) introducing silver and halide salts into a dispersing medium so that nucleation of the tabular grains occurs in the presence of iodide with chloride accounting for at least 50 mole percent of the halide present in the dispersing medium and the pCl of the dispersing medium being maintained in the range of from 0.5 to 3.5 and (b) following nucleation completing grain growth under conditions that maintain the {100} major faces of the tabular grains.