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:
Feb. 26, 1991
Filed:
Jun. 21, 1990
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A method for forming a direct positive image composed of the step of developing with a surface developer an imagewise exposed photosensitive material compose of support having thereon at least one photosensitive emulsion layer containing unprefogged silver halide grains capable of forming an internal latent image; the at least the photosensitive emulsion layer composed of hexagonal tabular silver halide grains in an amount of at least 30 wt %, based on the total silver amount of silver halide grains therein; the hexagonal tabular grains having two parallel hexagonal faces, the ratio of the longest side to the shortest side of the hexagon being at most 2; the aspect ratio of the hexagonal tabular grains being from 2 to 8; and the hexagonal tabular grains having a monodisperse size distribution. The method provides increases in processing speed, maximum density, and contrast in the toe portion, and an improvement in graininess, even when exhausted processing solutions are used.