Patents by Inventor Robert J. Hafeli

Robert J. Hafeli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of hygienic disposal of chlorine-containing plastic material
    Patent number: 4031192
    Abstract: To dispose of high-polymer, chlorine-containing plastics, such as PVC, without liberating hydrochloric acid in the atmosphere, the material is placed in a closed vessel and contacted with super-heated steam to split off gaseous hydrochloric acid; the resulting mixture of water vapor, steam and hydrochloric acid is removed, cooled and condensed, so that hydrochloric acid can be derived therefrom; the residue of the material after the hydrochloric acid has been removed can then be safely incinerated with other refuse, etc.
    Type: Grant
    Filed: August 27, 1975
    Date of Patent: June 21, 1977
    Assignee: Von Roll AG
    Inventor: Robert J. Hafeli