Imation Corporation

Minnesota Mining and Manufacturing Company

Other

Eastman-kodak Company

Andrew W Mott

Mark P Kirk

Dian E Stevenson

Robert J Nairne

Ranjan C Patel

Kevin P Hall

Rachel J Hobson

Nusrallah Jubran

Sharon Mary Simpson

Doreen Catherine Lynch

Justine A Mooney

Richard J Ellis

Stephen S Poon

Duncan M Grieve

John H Stibbard

David J Owen

Richard A Barcock

Robert J D Nairne

David C Bays

Martin D Attwood

David R McGill

Mark R I Chambers

Kim Marie Vogel

Kevin D Landgrebe

Roger A Mader

Gilbert L Eian

Raymond J Kenney

Takuzo Ishida

Carlo Marchesano

Richard R Ollmann, Jr

Charles G Barlow

Nicholas E Grzeskowiak

Elda Moizo

Alexis Sarah Zinn-Warner

Mark R Chambers

William E Bottomley

A L Beck

Sean D Slater

Silver halide imaging materials

A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by laser irradiation, which is useful in the production of colored images.

Laser absorbable photobleachable compositions

A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by leaser irradiation, which is useful in the production of colored images.

Organophotoreceptors for electrophotography featuring novel charge

A black-and-white, negative-acting, silver halide emulsion is described which gives improved image tone when used in a photographic element. The toning agents are based on dithio-substituted compounds having the following general structures: ##STR1## where R.sub.1 and R.sub.2, independently, are selected from the group consisting of alkyl, aryl and heterocyclic groups, or R.sub.1 and R.sub.2 together complete a ring;

Image toners for silver halide photographic films

A thermographic element comprising in a non-aqueous binder medium a silver salt oxidizing agent in reactive association with a compound comprising a plurality of redox color releasing moieties such that oxidation of each redox color releasing moiety causes release from said compound of a thermally diffusible dye. The compounds many of which are new incorporate two or more developer moieties into a single molecule to minimize the diffusibility of the compound. Following oxidation, either directly by the silver salt or by means of a cross-oxidizing agent, each oxidized developer moiety releases a thermally diffusible dye. The compounds are of sufficient size and molecular weight to slow or prevent diffusion in imaging systems and yet possess several active developer moieties per molecule which is advantageous over known ballasted dye releasers which comprise bulky molecules with only a single developer moiety.

Developing agents for (photo) thermographic systems

A method of chemical sensitisation which comprises providing a silver halide emulsion containing negative-acting silver halide grains, and adding to said silver halide emulsion a sulphur releasing organic polymer having multiple sulphur releasing groups per polymer molecule. The polymer preferably has at least 10 sulphur releasing groups per molecule which may be selected from thiocarbonate, dithiocarbonate, trithiocarbonate, dithioester, thioamide, thiocarbamate, dithiocarbamate, thiouram, thiourea, dithiooxamide, thioketone and trisulphide.

Chemical sensitisation of silver halide emulsions

A compound having a nucleus of the formula: ##STR1## The compounds are suitable for use as image stabilisers and antifoggants in photothermographic materials and exhibit acceptably low sensitization of human skin.

Photothermographic materials

The present invention relates to a black-and-white aqueous alkaline photographic developer composition, free of dihydroxybenzene developing agent, comprising a reductic acid developing agent and an auxiliary superadditive developing agent, wherein the reductic acid developing agent is represented by the formula (I): ##STR1## wherein, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each are selected from the group consisting of hydrogen and group CH.sub.2 R.sub.5, wherein R.sub.5 is hydrogen or a monovalent group, e.g. amino, cyano, halogen, hydroxyl, carboxyl, sulfonyl, alkyl, cycloalkyl, aryl. A process for forming a black-and-white photographic silver image comprising developing a silver halide photographic element with said black-and-white aqueous alkaline photographic developer composition is also described.

Photographic silver halide developer composition and process for forming

A photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:

Hydrazide redox-dye-releasing compounds for photothermographic elements

A medical radiographic element comprising a base bearing on each of its two major surfaces a layer of photographic silver halide emulsion sensitive to green light, said element having between the base and at least one silver halide layer a hydrophilic colloid layer containing a dye having a nucleus of the general formula: ##STR1## wherein: each R independently represents an alkyl group,

Silver halide photographic light sensitive element for medical

A compound having a nucleus of the formula: ##STR1## The compounds are suitable for use as image stabilizers and antifoggants in photothermographic materials and exhibit acceptably low sensitization of human skin.

A compound of the formula: ##STR1## wherein; R is a member selected from a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group. The compounds find utility as antifoggants and image stabilisers in photothermographic materials.

Growing community of inventors

Bishops Stortford, United Kingdom

Andrew W Mott