Title: Duplicating systems

Abstract: A process for hectographic duplicating, and hectographic copy paper therefor, are disclosed. The hectographic copy paper is formed by applying a coating of a film-forming vehicle and a colourless dyestuff precursor which is sodium p-carboxy phenyl leucauramine, sodium p-sulphophenyl leucauramine of Michler's hydrol methyl ether. The sheets are used to type or otherwise form an imaged hectographic master sheet, which is then contacted with hectographic copy sheets moistened with a spirit duplicating fluid, with the dyestuff precursors converted into dyestuffs on the hectographic copy sheets.

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Inventors: Neale, David John (Woodford Green, EN)
Dawney, Stanford Frederick (Brentwood, EN)

Application Number: 385706
Filing Date: 1973-08-06
Publication_date: 1976-01-06
Assignee: Lamson Industries Limited (London, EN)
Primary Class(es): 503/201 101/469, 101/472, 427/144, 427/146, 427/149, 427/261, 503/203, 503/224
Other Classes:
US Patent Ref:

2927041	Mar, 1960	Davis	117/36.
3036924	May, 1962	Newman	106/14.
3230875	Jan, 1966	Newman	117/36.

Other Refs: 798,396835,930852,131

Jul, 1958	UK
May, 1960	UK
Oct, 1960	UK

Primary Examiner: Herbert, Jr., Thomas J.
Assistant Examiner:
Attorney: Cushman, Darby & Cushman