The true inventor of Twin-sheet Technology is Georg Geiß!
Strong competition sometimes leads to strange happenings. For example if one attributes achievements of their own competition to oneself - as it happened in the magazine "Thermoforum", Issue Autumn 2001, where company BROWN Machine claims: "The twin sheet technology, invented and developed by Brown Machine". The GEISS-patent, specification no. 1 296 350, from 24th of June 1963 "Apparatus for production of twinwalled containers" shows who was the first one!
So far the GEISS company has successfully produced the following parts by the Twin-sheet process: