Eastman-kodak Company

Richard B Anderson

Norman W Kalenda

Robert E Dickerson

Steven G Link

Richard A Landholm

Wayne W Weber, Ii

Fred M Macon

Elaine H Hoffmeister

Donald R Diehl

Anthony Adin

Ronda E Factor

Martyn Lewis

Dyes of formula (I) below are described. The dyes are useful as mid-green sensitizing dyes for photographic materials ##STR1## In the above formula, R1 and R3 are methyl or ethyl, at least one of R1 and R3 being methyl. R2 and R4 are substituted or unsubstituted C.sub.1 to C.sub.6 alkyl, provided that R2 and R4 are not both methyl. X1, X2, X3, and X4 are each independently methyl, methylthio, fluoro-substituted methyl or methylthio, or hydrogen, provided that at least one of X1 and X2 and at least one of X3 and X4 are not hydrogen. Y represents an ion as needed to balance the charge of the molecule. The dyes of formula (I) sensitize silver halide to light in the mid-green region of the spectrum.

Mid-green sensitizing dyes for photographic materials

A radiographic element is disclosed comprised of a transparent film support and spectrally sensitized tabular grain silver halide emulsion layer units coated on opposite sides of the film support. At least one of the emulsion layer units is comprised of tabular grains having a thickness of less than 0.2 micrometer accounting for greater than 50 percent of total grain projected area and exhibiting an average tabularity of greater than 25. Adsorbed to the surface of the tabular grains is at least one benzimidazolocarbocyanine dye chosen for its high level of absorption in the mid-green spectral region at the emission line of gadolinium oxysulfide, terbium activated intensifying screens and its low residual stain in the fully processed film.

Tabular grain emulsion containing radiographic elements exhibiting

A photographic element is disclosed for handling under a first radiation source and imagewise exposure to a second radiation source having a solid particle dispersion filter dye layer that absorbs radiation emitted to which the element is sensitive emitted by the first source.

Imaging utilizing a light-handleable photographic element having solid

A motion control system for a reel to reel web transport apparatus which maintains a controlled tension on a web as it is transported between reels. The motion control system includes brushless direct current motors directly coupled each reel. A magnetic hysteresis brake is coupled to each reel by means of respective one-way clutches. During transport of the web from reel to reel, a magnetic hysteresis brake applies a controlled torque only to the reel supplying web. Thus, a controlled tension is maintained on the web at all times, even during loss of power to the DC motors.

Motion control system for reel to reel web transport apparatus

Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a releasable, bridged, azoaminophenol magenta dye moiety or precursor thereof having the formula: ##STR1## wherein: (a) R represents hydrogen, a hydrolyzable moiety or CAR;

Photographic products and processes employing novel nondiffusible

Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a releasable, pyridylazo(dialkylamino)phenol magenta dye moiety or precursor thereof, having the formula: ##STR1## wherein: (a) R represents hydrogen, a hydrolyzable moiety, or may be taken together with the NHSO.sub.2 group to which it is attached to form CAR;

Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a releasable 2-(5-nitro-2-pyridylazo)-1-naphthol dye moiety. The compound contains a ballasted carrier moiety which is capable of releasing the diffusible azo dye under alkaline conditions. The dye is transferred imagewise to an image-receiving layer where it is contacted with metal ions to form a metal-complexed azo dye transfer image of excellent stability.

Growing community of inventors

Rochester, NY, United States of America

Richard B Anderson