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. 25, 1990
Filed:
Sep. 20, 1989
Karl Vogel, Alzenau-Michelbach, DE;
Degussa Aktiengesellschaft, Frankfurt, DE;
Abstract
The invention concerns a method for dry-pelletizing carbon black, allowing to control pellet quality and increasing the output of any particular pelletizing apparatus. The method calls for pre-compacting the material to be pelletized by means of vacuum before or during pelletizing. The invention also includes two apparatus to carry out the single-stage method version, comprising a pelletizing drum in which are mounted vacuum filter surfaces to pre-compact the powdery initial material in parallel with the on-going prepelletizing procedure. In one apparatus, the inside surface of the drum is a filter surface, in the other apparatus, bundles of stationary filter pipes are provided in the lower drum space.