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:
Aug. 28, 1984
Filed:
Jun. 02, 1983
James W Foley, Andover, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
This invention relates to photographic processes and products for forming an image in dye from a colorless precursor of a preformed image dye which is substituted with a moiety comprising a 1,3-sulfur-nitrogen group, said 1,3-sulfur-nitrogen group (a) being capable of undergoing cleavage in the presence of silver ion and/or soluble silver complex, and (b) possessing an amide substituent on the carbon atom in the 2-position that undergoes an intramolecularly accelerated cleavage reaction following the cleavage of said 1,3-sulfur-nitrogen group, which moiety maintains said precursor in its colorless form at least until the 1,3-sulfur-nitrogen group undergoes said cleavage. In a further embodiment, the cleavage of the amide substituent following the cleavage of the 1,3-sulfur-nitrogen group is used to provide an imagewise distribution of a photographically useful reagent, which reagent may be, for example, a photographically active reagent.