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:
Aug. 05, 1980
Filed:
Dec. 29, 1977
Eckehard Stein, Frankfurt am Main, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
This invention relates to an improvement in the process for conducting ammonia in a developing apparatus for developing diazotype copying material, wherein exhaust air laden with gaseous ammonia and composed of the developer medium escaping from a developing chamber and air, is conducted in at least one absorption vessel countercurrently to water capable of absorbing ammonia; wherein the ammonia water of relatively low concentration thus obtained is conducted in an evaporator countercurrently to a stream of water vapor; and wherein the ammonia gas/water vapor mixture thus obtained is used for preparing the gaseous developer medium; the improvement comprising completely condensing the ammonia gas/water vapor mixture discharged from the evaporator to form ammonia water of a relatively high concentration; storing the ammonia water in an ammonia water supply tank; introducing the ammonia water discharged from the ammonia water supply tank, at a constant rate, into an evaporator which is in direct connection with the developing chamber; and passing the ammonia gas/water vapor mixture produced by evaporation from the evaporator into the developing chamber. The invention also relates to an apparatus for performing the process.