The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 1980
Filed:
Dec. 15, 1977
Herbert Schroter, Taunusstein, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
This invention relates to an improvement in a developing apparatus, especially as part of a photoprinting machine, for developing diazotype copying material capable of being developed by an atmosphere containing gaseous ammonia and water vapor, including a developing chamber comprising at least one first, heated, inclined evaporator trough to which fresh ammonia is adapted to be fed at one side while ammonia water with a reduced ammonia content is adapted to be drained off at the other side, the ammonia water with the reduced ammonia content being adapted to form a pool, and further comprising a siphon through which the ammonia water with the reduced ammonia content and condensate formed in the developing chamber are adapted to be drained off, the improvement that the siphon forms part of an evaporator arranged outside of the developing chamber from which a developer gas pipe leads into the developing chamber, and further comprising a, preferably unheated, reservoir for the ammonia water with the reduced ammonia content adapted to flow from the evaporator trough, the reservoir substantially covering the entire floor space of the developing chamber and being completely open at its top, having an opening which leads to the outside evaporator and being positioned in the chamber at such a level that the bottom of the reservoir is adapted to be completely covered by the pool of ammonia water with reduced ammonia content. The invention also relates to a method of operating the developing apparatus.