Abstract: A process of forming a dye mordant precursor for a photographic system by reacting a p-amino phenethyl alcohol with a trialkyl phosphate at a controlled temperature, and dehydrating the resultant p-dialkyl amino phenethyl alcohol with a strong alkali in the presence of a polymerization inhibitor.

Abstract: Method for making sheet materials are disclosed having a layer or layers of a non-uniform thickness, in particular a method of making sheet materials tapered from a maximum thickness near one and to a minimum thickness near the opposite end; and sheet materials prepared by such methods. The preparation of photographic film assemblages is disclosed including a first sheet material including at least one photosensitive layer and a second sheet material in super position therewith, which assemblages are adapted for forming photographic images viewable as reflection prints without separation of the respective sheet materials.

Abstract: A developed and fixed unwashed negative component of a diffusion transfer photographic film unit is protected and preserved for an extended period.

Abstract: A composite light-polarizing lens comprising a light-polarizing element having coated on each surface thereof a layer which enhances adhesion between in situ formed lens components and inhibits migration of lens constituents between said light-polarizing elements and said in situ polymerized components during formation of said lens.

Abstract: Novel polymeric derivatives of tetrazole-5-thiols and their metal and ammonium salts, and the preparation of such compounds which are useful as gelatin thickeners or in their production, are disclosed.