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Poon; Stephen S. C.
Harlow, GB2
No. of patents:

Patent Number Title Of Patent Date Issued
4981775 Photothermographic elements January 1, 1991
A photothermographic element comprising a support bearing an image forming system comprising:(a) a photosensitive silver halide(b) an organic silver compound(c) a polymer binder and(d) a reducing agent for the organic silver compound, characterized in that the reducing agent comprises a redo
4594312 Heat bleachable dye systems June 10, 1986
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,at least one of R.sup.1 to R.sup.4 represent hydrogen and the remainder of R.sup.1 to R
4581323 Photothermographic element having topcoat bleachable antihalation layer April 8, 1986
A photothermographic element comprising a reflective base having coated thereon one or more layers constituting a photothermographic imaging medium in which a bleachable antihalation medium is coated over said photothermographic imaging medium, the components of the antihalation medi
4548896 Dye-bleach materials and process October 22, 1985
An imagewise bleachable composition is described comprising a dye in reactive association with a mesoionic compound. The composition may be bleached by radiation at wavelengths between 200 and 1000 nm.

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