Variable volume diazotype developing apparatus and method
AssigneeDiazit Company, Inc.
InventorHenry W. Patrick
Life of this patent
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Abstract
Diazotype developing apparatus and method in which a gaseous developing medium, such as a mixture of ammonia and air of predetermined concentration, is contained within a containing system, which includes the developing chamber of the apparatus, and the volume of the containing system is variable with only negligible changes in the pressure within the containing system so as to allow the volume of gaseous developing medium to be maintained within the containing system at essentially the same pressure as the pressure of the surrounding ambient atmosphere during variations in the volume of gaseous developing medium within the containing system resulting from operation of the apparatus.
Claims11
In a diazotype developing apparatus in which a gaseous developing medium of predetermined concentration is supplied to a containing system within which the gaseous developing medium is to be isolated from the surrounding ambient atmosphere, the containing system including a developing chamber, the improvement comprising variable volume means for enabling the volume of the containing system to be varied with only negligible changes in the pressure within the containing system so as to allow the volume of gaseous developing medium of predetermined concentration to be maintained within the containing system at essentially the same pressure as the pressure of the surrounding ambient atmosphere during variations in the volume of gaseous developing medium within the containing system resulting from operation of the apparatus.
The method of minimizing the interchange between a gaseous developing medium of predetermined concentration contained within a containing system, which includes a developing chamber of a diazotype developing apparatus, and the air in the ambient atmosphere surrounding the containing system, due to any leakage during operation of the apparatus, said method comprising the steps of:
- operating the developing apparatus in such a way as to cause variations in the volume of gaseous developing medium within the containing system;
- and
- varying the volume of the containing system with only negligible changes in the pressure within the containing system so as to allow the volume of gaseous developing medium of predetermined concentration to be maintained within the containing system at essentially the same pressure as the pressure of the surrounding ambient atmosphere during said variations in the volume of gaseous developing medium within the containing system.
Dependencies are inferred from the claim text.