|5385638||Method of manufacturing a stamper|
A method of manufacturing a stamper includes the steps of coating a flat surface of a substrate with photosensitive material; directing light to a specified position on the photosensitive material to expose it; developing the photosensitive material to ma...
|4254544||Method of casting photographic representation having tonal and height contrasts and the article so cast|
The method of casting a representation of a photograph that includes forming an etched plate through a half-toned screen of the photograph, making a mold cavity of the plate, making a wax impression of the rubber mold with the wax impression not completel...
|4106408||Duplicator cylinder construction|
Cylinders for lithographic printing machines having hard, non-porous surfaces are made without plating by forming a thin stainless steel sheet into a cylindrical shape and disposing it against the wall of a cylindrical mould. Cast iron is poured into the ...