Granulated screen and a method of manufacturing same
AssigneeLicht Druck Ag
InventorHans E. Muller
Life of this patent
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Abstract
A thin translucent film is applied onto a plate of glass by pouring an asphalt solution on such plate. The asphalt coating is dried under influence of light whereby the asphalt will become insoluble and a fine grain is developed. This grain is thereafter printed optically onto a photosensitive material.
Claims3
A method of manufacturing a granulated screen comprising depositing a thin asphalt solution on a plate of glass;
- drying said asphalt solution under the influence of light to form a fine grain having a grain number of at least about 300 grains/cm;
- and optically printing said grain onto a photosensitive material.
An improved granulated screen, including a glass plate covered by a translucent layer incorporating the grain, which grain is intended to be printed optically onto a photosensitive material, wherein said translucent layer comprises asphalt which is dried under the influence of light, wherein the specific weight of said asphalt is about 0.9 grams/cubic centimeter and the mean thickness of said layer is about 0.003 millimeters.
Dependencies are inferred from the claim text.