Minnesota Mining and Manufacturing Company

Bernard A Lea

Ronald W Burrows

Ivan H Skoog

Charles G Barlow

Thomas D Hellings

Jonathan P Kitchin

Stephen S Poon

Gebran J Sabongi

Keith A Penfound

Infra-red sensitizing dyes for silver halide having a nucleus of the general formula: ##STR1## in which Q represents Cl or Br,

Infra-red sensitizing dyes for silver halide

Infra-red sensitizing dyes for silver halide having a mucleus of the general formula: ##STR1## in which: Q represents Cl or Br,

Infra-red sensitising dyes for silver halide

High contrast negative acting silver halide emulsions suitable for laser scanning applications comprising a Group VIII metal compound and one or more spectrally sensitizing dyes of the formula ##STR1## The emulsions have good long term stability and good sensitivity.

Silver halide photographic materials

Photothermographic elements of the dry silver type may be sensitized to the infrared with sensitizing dyes of the formula: ##STR1## in which: R.sup.1 represents a lower alkyl group of from 1 to 5 carbon atoms and

Sensitizers for photothermographic media

Photothermographic elements containing heat bleachable acutance/antihalation dyes and thermographic elements employing heat bleachable dyes of the formula: ##STR1## in which: n is 2, 3, 4 or 5,

Heat bleachable dye systems

A photographic element of the conventional wet processed type or of the dry silver type which includes an antihalation or acutance dye which absorbs in the near infrared and has a relatively low visible absorption while retaining a high extinction coefficient at .sub.max. The dye is of the general formula: ##STR1## in which: m+p=2,

Photographic elements incorporating antihalation and/or acutance dyes

Images produced in photothermographic emulsions using silver halide as a light-sensitive material therein suffer from light scattering effects on the silver halide. Acutance dyes, many of which are novel, are disclosed which can absorb scattered light and which are bleached at the development temperature of the photothermographic composition.

Thermolabile acutance dyes for dry silver

Magenta acutance dyes for photothermographic emulsions are disclosed.

Growing community of inventors

Harlow, United Kingdom

Bernard A Lea